What Does The Clock Drawing Test Measure

Purpose

The CDT is used to quickly assess visuospatial and praxis abilities, and may decide the presence of both attention and executive dysfunctions (Adunsky, Fleissig, Levenkrohn, Arad, & Nov, 2002; Suhr, Grace, Allen, Nadler, & McKenna, 1998; McDowell, & Newell, 1996).

The CDT may be used in addition to other quick screening Testing for illness in people without symptoms.
tests such every bit the Mini-Mental Country Test (MMSE), and the Functional Independence Mensurate (FIM).

In-Depth Review

Purpose of the mensurate

The CDT is used to quickly assess visuospatial and praxis abilities, and may determine the presence of both attention and executive dysfunctions (Adunsky, Fleissig, Levenkrohn, Arad, & Nov, 2002; Suhr, Grace, Allen, Nadler, & McKenna, 1998; McDowell & Newell, 1996).

The CDT may be used in addition to other quick screening Testing for affliction in people without symptoms.
tests such equally the Mini-Mental State Examination (MMSE), and the Functional Independence Measure (FIM).

Available versions

The CDT is a simple task completion exam in its virtually basic form. There are several variations to the CDT:

Verbal command:

Costless drawn clock:
The individual is given a bare sheet of newspaper and asked starting time to describe the face of a clock, place the numbers on the clock, and so draw the easily to indicate a given time. To successfully complete this task, the patient must kickoff draw the contour of the clock, then place the numbers 1 through 12 inside, and finally indicate the correct time by drawing in the easily of the clock.
Pre-fatigued clock:
Alternatively, some clinicians prefer to provide the individual with a pre-fatigued circumvolve and the patient is just required to place the numbers and the hands on the face of the clock. They argue that the patient's power to fill in the numbers may be adversely afflicted if the contour is poorly drawn. In this task, if an private draws a completely normal clock, information technology is a fast indication that a number of functions are intact. However, a markedly abnormal clock is an of import indication that the individual may have a cerebral deficit, warranting farther investigation.

Regardless of which type is used (free drawn or pre-fatigued), the verbal command CDT can simultaneously appraise a patient's linguistic communication function (verbal comprehension); memory part (retrieve of a visual engram, short-term storage, and call up of fourth dimension setting instructions); and executive function. The verbal command variation of the CDT is highly sensitive for temporal lobe dysfunction (due to its heavy involvement in both memory and linguistic communication processes) and frontal lobe dysfunction (due to its mediation of executive planning Planning ability involves anticipating futurity events, formulating a goal or endpoint, and devising a sequence of steps or deportment that will achieve the goal or endpoint" (Anderson, 2008, p. 17)
) (Shah, 2002).

Copy command:

The individual is given a fully drawn clock with a certain time pre-marked and is asked to replicate the drawing equally closely as possible. The successful completion of the re-create command requires less utilize of language and retentivity functions but requires greater reliance on visuospatial and perceptual processes.

Copy command clock

Clock reading test:
A modified version of the re-create command CDT simply asks the patient to read aloud the indicated time on a clock drawn by the examiner. The re-create command clock-drawing and clock reading tests are good for assessing parietal lobe lesions such every bit those that may result in hemineglect. It is important to do both the verbal control and the copy command tests for every patient as a patient with a temporal lobe lesion may copy a pre-fatigued clock adequately, whereas their clock drawn to exact command may show poor number spacing and incorrect time setting. Conversely, a patient with a parietal lobe lesion may draw an adequate clock to verbal command, while their clock drawing with the copy command may bear witness obvious signs of neglect.

Time-Setting Instructions:

The most common setting chosen by clinicians is "3 O'clock" (Freedman, Leach, Kaplan, Winocur, Shulman, & Delis, 1994). Although this setting fairly assesses comprehension and motor execution, it does not indicate the presence of whatsoever left neglect the patient may have because information technology does not require the left half of the clock to be used at all. The fourth dimension setting "10 after xi" is an platonic setting (Kaplan, 1988). It forces the patient to attend to the whole clock and requires the recoding of the control "10" to the number "two" on the clock. It besides has the added advantage of uncovering any stimulus-bound errors that the patient may brand. For instance, the presence of the number "10" on the clock may trap some patients and forestall the recoding of the command "x" into the number "two." Instead of drawing the minute hand towards the number "2" on the clock to signal "ten after," patients prone to stimulus-jump errors volition fixate and draw the infinitesimal paw toward the number "10" on the clock.

Features of the measure

Scoring:

There are a number of dissimilar ways to score the CDT. In full general, the scores are used to evaluate whatsoever errors or distortions such as neglecting to include numbers, putting numbers in the wrong identify, or having wrong spacing (McDowell & Newell, 1996). Scoring systems may be elementary or circuitous, quantitative or qualitative in nature. Equally a quick preliminary screening Testing for disease in people without symptoms.
tool to simply detect the presence or absence of cerebral damage, you may wish to use a simple quantitative method (Lorentz et al., 2002). Still, if a more complex assessment is required, a qualitative scoring arrangement would exist more than telling.

Dissimilar scoring methods take been plant to be better suited for unlike subject groups (Richardson & Glass, 2002; Heinrik, Solomesh, & Berkman, 2004). In patients with stroke Besides called a "encephalon assail" and happens when brain cells dice considering of inadequate claret menstruation. 20% of cases are a hemorrhage in the brain caused by a rupture or leakage from a blood vessel. 80% of cases are as well know as a "schemic stroke", or the formation of a blood clot in a vessel supplying claret to the brain. More , no single standardized method of scoring exists. Suhr, Grace, Allen, Nadler, and McKenna (1998) examined the utility of the CDT in localizing lesions in 76 patients with stroke Too called a "brain attack" and happens when brain cells die because of inadequate blood flow. xx% of cases are a hemorrhage in the brain caused by a rupture or leakage from a blood vessel. eighty% of cases are likewise know every bit a "schemic stroke", or the formation of a blood clot in a vessel supplying blood to the brain. More than and 71 controls. Six scoring systems were used to appraise clock drawings (Freedman et al., 1994; Ishiai, Sugishita, Ichikawa, Gono, & Watabiki, 1993; Mendez, Ala, & Underwood, 1992; Rouleau, Salmon, Butters, Kennedy, & McGuire, 1992; Sunderland et al., 1989; Tuokko, Hadjistavropoulos, Miller, & Beattie, 1992; Watson, Arfken, & Birge, 1993; Wolf-Klein et al., 1989). Pregnant differences were found between controls and patients with stroke Also called a "encephalon set on" and happens when brain cells die because of inadequate blood flow. 20% of cases are a hemorrhage in the encephalon caused by a rupture or leakage from a claret vessel. 80% of cases are also know equally a "schemic stroke", or the formation of a blood clot in a vessel supplying claret to the brain. More on all scoring systems for both quantitative and qualitative features of the CDT. Withal, quantitative indices were not helpful in differentiating betwixt diverse stroke Also called a "brain assail" and happens when encephalon cells die because of inadequate blood catamenia. 20% of cases are a hemorrhage in the brain caused by a rupture or leakage from a claret vessel. 80% of cases are also know as a "schemic stroke", or the germination of a blood jell in a vessel supplying blood to the brain. More groups (left versus right versus bilateral stroke Also called a "brain attack" and happens when brain cells die because of inadequate blood flow. 20% of cases are a hemorrhage in the brain caused by a rupture or leakage from a blood vessel. 80% of cases are also know as a "schemic stroke", or the formation of a claret jell in a vessel supplying blood to the brain. More ; cortical versus subcortical stroke Also called a "brain attack" and happens when brain cells die because of inadequate blood menses. 20% of cases are a hemorrhage in the brain caused past a rupture or leakage from a blood vessel. 80% of cases are also know as a "schemic stroke", or the formation of a blood clot in a vessel supplying claret to the encephalon. More ; anterior versus posterior stroke Also called a "brain assail" and happens when brain cells die because of inadequate blood menstruum. 20% of cases are a hemorrhage in the brain caused by a rupture or leakage from a blood vessel. 80% of cases are also know every bit a "schemic stroke", or the formation of a blood clot in a vessel supplying blood to the brain. More than ). Qualitative features were helpful in lateralizing lesion site and differentiating subcortical from cortical groups.

A psychometric study in patients with stroke Also called a "brain assault" and happens when brain cells die because of inadequate claret flow. 20% of cases are a hemorrhage in the brain caused by a rupture or leakage from a blood vessel. eighty% of cases are also know as a "schemic stroke", or the formation of a blood jell in a vessel supplying blood to the brain. More than past Southward, Greve, Bianchini, and Adams (2001) compared 3 scoring systems: the Rouleau rating scale (1992); the Freedman scoring system (1994), and the Libon revised organisation (1993). These scoring systems were found to be reliable in patients with stroke Also called a "brain attack" and happens when brain cells die because of inadequate blood period. 20% of cases are a hemorrhage in the brain caused by a rupture or leakage from a blood vessel. eighty% of cases are likewise know equally a "schemic stroke", or the formation of a blood clot in a vessel supplying claret to the brain. More (delight see for the details of this study).

Subscales:

None typically reported.

Equipment:

Only a newspaper and pencil is required. Depending on the method called, yous may need to gear up a circumvolve (about 10 cm in diameter) on the paper for the patient.

Training:

The CDT can be administered past individuals with trivial or no training in cerebral assessment. Scanlan, Brush, Quijano, & Borson (2002) plant that a simple binary rating of clock drawings (normal or abnormal) past untrained raters was surprisingly effective in classifying subjects every bit having dementia or not. In this report, a common fault of untrained scorers was failure to recognize incorrect spacing of numbers on the clock face up as aberrant. By directing at this type of error, cyclopedia between untrained and expert raters should improve.

Time:

All variations of the CDT should take approximately 1-2 minutes to consummate (Ruchinskas & Curyto, 2003).

Culling forms of the CDT

The Clock Cartoon Test-Modified and Integrated Arroyo (CDT-MIA) is a four-step, xx-item instrument, with a maximum score of 33. The CDT-MIA emphasizes differential scoring of contour, numbers, hands, and center. It integrates 3 existing CDT's:

Freedman et al'southward free-fatigued clock (1994) on some item definitions
Scoring techniques adapted from Paganini-Hill, Clark, Henderson, & Birge (2001)
Some items borrowed from Royall, Cordes, & Polk (1998) executive CLOX

The CDT-MIA was found to be reliable and valid in individuals with dementia, yet this mensurate has not been validated in the stroke Also called a "encephalon assault" and happens when brain cells die because of inadequate blood menses. 20% of cases are a hemorrhage in the brain caused by a rupture or leakage from a blood vessel. 80% of cases are also know equally a "schemic stroke", or the formation of a claret jell in a vessel supplying blood to the brain. More population (Heinik et al., 2004).

Client suitability

Can be used as a screening instrument with:

Virtually any patient population (Wagner, Nayak, & Fink, 1995). The examination appears to exist differentially sensitive to some types of affliction processes. Particularly, it has proven to be clinically useful in differentiating amid normal elderly, patients with neurodegenerative or vascular diseases, and those with psychiatric disorders, such as depression Disease involving the body, mood, and thoughts, that affects the way a person eats and sleeps, the way i feels about oneself, and the way one thinks nigh things. A depressive disorder is not the same as a passing blue mood or a sign of personal weakness or a condition that can be wished abroad. People with a depressive disease cannot merely "pull themselves together" and become better. Without treatment, symptoms tin last for weeks, months, or years. Appropriate treatment, notwithstanding, can assist most people with depression.
and schizophrenia (Dastoor, Schwartz, & Kurzman, 1991; Heinik, Vainer-Benaiah, Lahav, & Drummer, 1997; Lee & Lawlor, 1995; Shulman, Golden, & Cohen, 1993; Spreen & Strauss, 1991; Tracy, De Leon, Doonan, Musciente, Ballas, & Josiassen, 1996; Wagner et al., 1995; Wolf-Klein, Silverstone, Levy, & Brod, 1989).

Can be used with:

Patients with stroke Too called a "encephalon attack" and happens when brain cells die because of inadequate blood flow. xx% of cases are a hemorrhage in the brain caused by a rupture or leakage from a blood vessel. eighty% of cases are besides know as a "schemic stroke", or the formation of a claret clot in a vessel supplying blood to the encephalon. More than . Considering the CDT requires a nonverbal response, it may be administered to those with speech difficulties but who have sufficient comprehension to empathise the requirement of the task.

Should non be used in:

Patients who cannot sympathise spoken or written instructions
Patients who cannot write

As with many other neuropsychological screening Testing for affliction in people without symptoms.
measures, the CDT is affected by historic period, education, conditions such as visual fail and hemiparesis, and other factors such as the presence of low Illness involving the body, mood, and thoughts, that affects the mode a person eats and sleeps, the style one feels about oneself, and the way ane thinks about things. A depressive disorder is not the aforementioned as a passing bluish mood or a sign of personal weakness or a condition that can be wished away. People with a depressive disease cannot merely "pull themselves together" and get better. Without handling, symptoms can last for weeks, months, or years. Appropriate handling, however, can help almost people with depression.
(Ruchinskas & Curyto, 2003; Lorentz, Scanlan, & Borson, 2002). The degree to which these factors affect ones score depends much on the scoring method applied (McDowell & Newell, 1996). Moreover, the CDT focuses on correct hemisphere role, and so it is important to utilise this test in conjunction with other neuropsychological tests (McDowell & Newell, 1996).

In what languages is the measure out available?

The CDT can exist conducted in whatever linguistic communication. Borson et al. (1999) institute that language spoken did not have whatsoever direct effect on CDT exam performance.

Summary

What does the tool measure?	Visuospatial and praxis abilities, and may determine the presence of both attention and executive dysfunctions.
What types of clients tin can the tool be used for?	Most any patient population. It has proven to be clinically useful in differentiating amongst normal elderly, patients with neurodegenerative or vascular diseases, and those with psychiatric disorders, such equally low Illness involving the body, mood, and thoughts, that affects the way a person eats and sleeps, the way ane feels about oneself, and the fashion i thinks about things. A depressive disorder is not the aforementioned as a passing blue mood or a sign of personal weakness or a status that can be wished away. People with a depressive illness cannot merely "pull themselves together" and get better. Without treatment, symptoms can last for weeks, months, or years. Appropriate treatment, however, can help well-nigh people with depression. and schizophrenia.
Is this a screening Testing for disease in people without symptoms. or cess tool?	Screening Testing for disease in people without symptoms.
Fourth dimension to administrate	All variations of the CDT should accept approximately one-ii minutes to complete.
Versions	Verbal command: Free fatigued clock; Pre-drawn clock; Copy control: Copy command; Clock reading test Fourth dimension-setting: "10 after 11" The Clock Drawing Examination Modified and Integrated Approach (CDT-MIA)
Languages	The CDT can be conducted in whatsoever language.
Measurement Properties
Reliability Reliability tin can be defined in a diversity of means. It is more often than not understood to be the extent to which a measure out is stable or consequent and produces similar results when administered repeatedly. A more technical definition of reliability is that it is the proportion of "true" variation in scores derived from a particular measure. The full variation in any given score may be thought of every bit consisting of true variation (the variation of interest) and fault variation (which includes random error as well as systematic error). True variation is that variation which actually reflects differences in the construct under written report, e.g., the bodily severity of neurological impairment. Random error refers to "racket" in the scores due to chance factors, due east.g., a loud noise distracts a patient thus affecting his performance, which, in plough, affects the score. Systematic error refers to bias that influences scores in a specific direction in a fairly consistent way, due east.g., one neurologist in a group tends to rate all patients as being more disabled than do other neurologists in the group. There are many variations on the measurement of reliability including alternate-forms, internal consistency , inter-rater agreement , intra-rater agreement , and test-retest .	Test-retest: Out of 4 studies examining exam-retest reliability A way of estimating the reliability of a scale in which individuals are administered the same scale on two different occasions and and then the ii scores are assessed for consistency. This method of evaluating reliability is advisable just if the miracle that the calibration measures is known to exist stable over the interval betwixt assessments. If the phenomenon existence measured fluctuates substantially over fourth dimension, then the test-retest paradigm may significantly underestimate reliability. In using test-retest reliability, the investigator needs to take into account the possibility of practice effects, which can artificially inflate the judge of reliability (National Multiple Sclerosis Society). , three reported fantabulous test-retest and one found adequate exam-retest. Inter-rater: Out of seven studies examining inter-rater reliability A method of measuring reliability . Inter-rater reliability determines the extent to which two or more than raters obtain the same result when using the same instrument to mensurate a concept. , half dozen reported excellent inter-rater and 1 reported adequate (for examiner clocks) to splendid (for free-drawn and pre-drawn clocks inter-rater.
Validity The degree to which an assessment measures what information technology is supposed to measure.	Criterion: Predicted lower functional ability and increased need for supervision on hospital belch; poor physical power and longer length of stay in geriatric rehabilitation; activities Equally defined by the International Classification of Operation, Disability and Health, activity is the operation of a chore or activeness by an individual. Activity limitations are difficulties in functioning of activities. These are likewise referred to equally part. of daily living at maximal recovery. Construct: The CDT correlated fairly with the Mini-Mental State Exam and the Functional Independence Mensurate. Known groups: Significant differences betwixt Alzheimer's patients and controls detected by CDT.
Does the tool observe change in patients?	Not applicable
Acceptability	The CDT is short and uncomplicated. Information technology is a nonverbal task and may be less threatening to patients than responding to a series of questions.
Feasibility	The CDT is inexpensive and highly portable. It can be administered in situations in which longer tests would be impossible or inconvenient. Even the nearly complex administration and scoring organisation requires approximately 2 minutes. It tin be administered by individuals with minimal training in cognitive assessment.
How to obtain the tool?	A pre-drawn circle tin can be downloaded past clicking on this link: pre-drawn circumvolve

Psychometric Backdrop

Overview

Until recently, data on the psychometric backdrop of the CDT were limited. While there are many possible means to administer and score the CDT, the psychometric backdrop of all the various systems seem consistent and all forms correlate strongly with other cognitive measures (Scanlan et al., 2002; Ruchinskas & Curyto, 2003; McDowell & Newell, 1996). Further, scoring of the CDT has been plant to be both accurate and consequent in patients with stroke Also called a "brain attack" and happens when brain cells dice because of inadequate blood menstruum. 20% of cases are a hemorrhage in the brain caused past a rupture or leakage from a blood vessel. 80% of cases are likewise know as a "schemic stroke", or the formation of a blood jell in a vessel supplying claret to the brain. More (South et al., 2001).

For the purposes of this review, we conducted a literature search to identify all relevant publications on the psychometric properties of the more commonly practical scoring methods of the CDT. We then selected to review manufactures from loftier impact journals, and from a variety of authors.

Reliability

Test-retest:

Using Spearman rank social club correlations of the CDT has been reported by several investigators using a diversity of scoring systems:

Manos and Wu (1994) reported an "excellent" two-day exam-retest reliability A way of estimating the reliability of a scale in which individuals are administered the aforementioned scale on two unlike occasions and then the two scores are assessed for consistency. This method of evaluating reliability is advisable only if the phenomenon that the scale measures is known to be stable over the interval between assessments. If the miracle existence measured fluctuates substantially over time, then the exam-retest epitome may significantly underestimate reliability. In using test-retest reliability, the investigator needs to take into business relationship the possibility of practise furnishings, which can artificially inflate the judge of reliability (National Multiple Sclerosis Social club).
of 0.87 for medical patients and 0.94 for surgical patients.
Tuokko et al. (1992) reported an "adequate" test-retest reliability A way of estimating the reliability of a calibration in which individuals are administered the same scale on 2 dissimilar occasions and then the 2 scores are assessed for consistency. This method of evaluating reliability is appropriate only if the phenomenon that the scale measures is known to be stable over the interval between assessments. If the phenomenon existence measured fluctuates essentially over time, and so the exam-retest epitome may significantly underestimate reliability. In using test-retest reliability, the investigator needs to take into account the possibility of practice effects, which tin can artificially inflate the gauge of reliability (National Multiple Sclerosis Society).
of 0.70 at iv days.
Mendez et al. (1992) reported and "excellent" coefficients of 0.78 and 0.76 at iii and 6 months, respectively.
Freedman et al. (1994) reported test-retest reliability A way of estimating the reliability of a scale in which individuals are administered the same scale on two dissimilar occasions and so the two scores are assessed for consistency. This method of evaluating reliability is advisable only if the miracle that the scale measures is known to be stable over the interval between assessments. If the phenomenon being measured fluctuates substantially over time, and then the test-retest prototype may significantly underestimate reliability. In using test-retest reliability, the investigator needs to take into account the possibility of practice effects, which tin artificially inflate the estimate of reliability (National Multiple Sclerosis Social club).
as "very depression". All the same, when the "x after xi" time setting was used with the examiner clock, which is known to be a more than sensitive setting for detecting cognitive dysfunction, test-retest reliability A mode of estimating the reliability of a scale in which individuals are administered the same scale on ii dissimilar occasions and then the ii scores are assessed for consistency. This method of evaluating reliability is appropriate just if the phenomenon that the scale measures is known to be stable over the interval betwixt assessments. If the phenomenon being measured fluctuates essentially over time, then the test-retest paradigm may significantly underestimate reliability. In using test-retest reliability, the investigator needs to take into business relationship the possibility of practice effects, which tin artificially inflate the estimate of reliability (National Multiple Sclerosis Society).
was found to exist "excellent" (0.94).

Inter-rater:

Inter-rater reliability A method of measuring reliability . Inter-rater reliability determines the extent to which ii or more raters obtain the aforementioned result when using the same instrument to measure a concept.
of the CDT, equally indicated by Spearman rank order correlations (non the preferred method of analyses for assessing inter-rater reliability A method of measuring reliability . Inter-rater reliability determines the extent to which two or more than raters obtain the same upshot when using the aforementioned instrument to mensurate a concept.
but i used in earlier measurement research), has besides been reported by several investigators:

Sunderland et al. (1989) found "excellent" coefficients ranging from 0.86 to 0.97 and institute no difference between clinician and non-clinician raters (0.84 and 0.86, respectively).
Rouleau et al. (1992) found "fantabulous" inter-rater reliability A method of measuring reliability . Inter-rater reliability determines the extent to which two or more raters obtain the same effect when using the aforementioned instrument to mensurate a concept.
, with coefficients ranging from 0.92 to 0.97.
Mendez et al. (1992) reported "fantabulous" inter-rater reliability A method of measuring reliability . Inter-rater reliability determines the extent to which ii or more raters obtain the same result when using the same musical instrument to measure a concept.
of 0.94.
Tuokko et al. (1992) reported loftier coefficients ranging from 0.94 to 0.97 across iii annual assessments.
The modified Shulman scale (Shulman, Gold, Cohen, & Zucchero, 1993) besides has "excellent" inter-rater reliability A method of measuring reliability . Inter-rater reliability determines the extent to which two or more than raters obtain the aforementioned upshot when using the aforementioned musical instrument to measure a concept.
(0.94 at baseline, 0.97 at 6 months, and 0.97 at 12 months).
Manos and Wu (1994) obtained "excellent" inter-rater reliability A method of measuring reliability . Inter-rater reliability determines the extent to which 2 or more than raters obtain the same result when using the same instrument to mensurate a concept.
coefficients ranging from 0.88 to 0.96.
Freedman et al. (1994) reported coefficients ranging from 0.79 to 0.99 on the complimentary-fatigued clocks, 0.84 to 0.85 using the pre-drawn contours, and 0.63 to 0.74 for the examiner clocks, demonstrating "excellent" inter-rater reliability A method of measuring reliability . Inter-rater reliability determines the extent to which two or more raters obtain the same upshot when using the aforementioned instrument to measure out a concept.
.

South et al. (2001) compared the psychometrics of 3 dissimilar scoring methods of the CDT (Libon revised system; Rouleau rating scale; and Freedman scoring system) in a sample of 20 patients with stroke Also chosen a "brain assail" and happens when brain cells die considering of inadequate claret period. xx% of cases are a hemorrhage in the brain caused by a rupture or leakage from a blood vessel. eighty% of cases are also know as a "schemic stroke", or the formation of a blood clot in a vessel supplying blood to the encephalon. More . Intra-rater reliability This is a type of reliability assessment in which the same assessment is completed by the same rater on two or more occasions. These different ratings are and then compared, generally by means of correlation. Since the same individual is completing both assessments, the rater'due south subsequent ratings are contaminated by knowledge of before ratings.
were measured using the intraclass correlation coefficient (ICC) Intraclass correlation (ICC) is used to measure inter-rater reliability for 2 or more raters. Information technology may also be used to assess exam-retest reliability. ICC may exist conceptualized as the ratio of between-groups variance to full variance. . Raters used comparable criteria for each score demonstrating "excellent" inter-rater reliability A method of measuring reliability . Inter-rater reliability determines the extent to which two or more than raters obtain the same result when using the same instrument to measure a concept.
. Raters used like scoring criteria throughout, demonstrating "excellent" intra-rater reliability This is a type of reliability cess in which the same assessment is completed past the aforementioned rater on two or more occasions. These unlike ratings are then compared, more often than not past means of correlation. Since the same individual is completing both assessments, the rater'southward subsequent ratings are contaminated by noesis of earlier ratings.
. South et al. (2001) concluded that while the Libon scoring system demonstrated a range of reliabilities beyond different domains, the Rouleau and Freedman systems were in the excellent range.

Validity

In a review, Shulman (2000) reported that nearly studies achieved sensitivities and specificities of approximately 85% and concluded that the CDT, in conjunction with other widely used tests such as the Mini-Mental State Examination (MMSE), could provide a meaning advance in the early detection of dementia. In contrast, Powlishta et al. (2002) concluded from their report that the CDT did not appear to be a useful screening Testing for illness in people without symptoms.
tool for detecting very mild dementia. Other authors have concluded that the CDT should non be used alone every bit a dementia screening Testing for disease in people without symptoms.
test because of its overall inadequate performance (Borson & Brush, 2002; Storey et al., 2001). Yet, nigh of the previous studies were based on relatively small sample sizes or were undertaken in a clinical setting, and their results may not be applicable to a larger community population.

Nishiwaki et al. (2004) studied the validity The caste to which an cess measures what information technology is supposed to measure.
of the CDT in comparison to the MMSE in a large full general elderly population (aged 75 years or older). The specificity Specificity refers to the probability that a diagnostic technique will indicate a negative examination issue when the condition is absent (true negative).
of the CDT for detecting moderate-to-severe cognitive impairment (MMSE score = 17) were 77% and 87%, respectively, for nurse In accuse of, merely not limited to, the "cess and provision of care needs; support and education for patients and families; discharge planning."(Suggested by Philips et al, 2002)
administration and twoscore% and 91%, respectively, for postal administration. The authors conclude that the CDT may take value as a brief face-to-face screening Testing for disease in people without symptoms.
tool for moderate/severe cognitive impairment in an older community population but is relatively poor at detecting milder cerebral impairment.

Few studies have examined the validity The caste to which an assessment measures what information technology is supposed to measure.
of the CDT specifically in patients with stroke Also called a "brain attack" and happens when encephalon cells dice because of inadequate blood flow. xx% of cases are a hemorrhage in the brain caused by a rupture or leakage from a blood vessel. 80% of cases are besides know as a "schemic stroke", or the formation of a blood clot in a vessel supplying claret to the brain. More . Adunsky et al. (2002) compared the CDT with the MMSE and cognitive Functional Independence Measure out (FIM) (cerebral tests used for the evaluation of functional outcomes at discharge in elderly patients with stroke Also called a "brain attack" and happens when encephalon cells die because of inadequate blood menstruation. xx% of cases are a hemorrhage in the brain caused by a rupture or leakage from a blood vessel. eighty% of cases are as well know as a "schemic stroke", or the formation of a blood clot in a vessel supplying blood to the brain. More ). The tests were administered to 151 patients admitted for inpatient rehabilitation following an acute stroke Also called a "brain attack" and happens when brain cells die because of inadequate blood flow. twenty% of cases are a hemorrhage in the brain caused by a rupture or leakage from a claret vessel. 80% of cases are too know as a "schemic stroke", or the formation of a blood clot in a vessel supplying blood to the brain. More . Correlation The extent to which two or more variables are associated with one another. A correlation can be positive (as one variable increases, the other also increases – for example acme and weight typically represent a positive correlation) or negative (as 1 variable increases, the other decreases – for example equally the cost of gasoline goes higher, the number of miles driven decreases. In that location are a wide diversity of methods for measuring correlation including: intraclass correlation coefficients (ICC), the Pearson product-moment correlation coefficient, and the Spearman rank-order correlation.
coefficients (Pearson correlation The extent to which 2 or more variables are associated with one some other. A correlation can exist positive (every bit one variable increases, the other also increases – for example pinnacle and weight typically represent a positive correlation) or negative (as ane variable increases, the other decreases – for example equally the cost of gasoline goes college, the number of miles driven decreases. At that place are a wide variety of methods for measuring correlation including: intraclass correlation coefficients (ICC), the Pearson product-moment correlation coefficient, and the Spearman rank-order correlation.
) between the three cognitive tests resulted in r-values ranging from 0.51 to 0.59. Adunsky et al. (2002) ended that they share a reasonable caste of resemblance to each other, bookkeeping for "adequate" concurrent validity To validate a new measure out, the results of the measure are compared to the results of the aureate standard obtained at approximately the same point in fourth dimension (meantime), then they both reflect the same construct. This arroyo is useful in situations when a new or untested tool is potentially more efficient, easier to administrate, more practical, or safer than another more established method and is being proposed as an alternative instrument. Meet too "gold standard."
of these tests.

Bailey, Riddoch, and Crome (2000) evaluated a test battery for hemineglect in elderly patients with stroke Also chosen a "brain attack" and happens when brain cells die because of inadequate claret flow. xx% of cases are a hemorrhage in the brain caused past a rupture or leakage from a claret vessel. 80% of cases are likewise know as a "schemic stroke", or the formation of a blood clot in a vessel supplying claret to the encephalon. More and determined that the CDT had questionable validity The caste to which an assessment measures what it is supposed to mensurate.
in the assessment of representational neglect. Further, consistent with previous findings (Ishiai et al., 1993; Kaplan et al., 1991), the utility of the CDT as a screening Testing for disease in people without symptoms.
measure out for fail was not supported from these results. Reasons include the subjectivity in scoring, and questionable validity The degree to which an assessment measures what it is supposed to measure.
in that the task may too reflect cognitive harm (Freidman, 1991), constructional apraxia, or impaired planning Planning ability involves anticipating time to come events, formulating a goal or endpoint, and devising a sequence of steps or actions that will achieve the goal or endpoint" (Anderson, 2008, p. 17)
ability (Kinsella, Packer, Ng, Olver, & Stark, 1995).

Responsiveness

Not applicable.

References

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Come across the measure

Click here to notice a pre-drawn circumvolve that can be used when administering the CDT.

Source: https://strokengine.ca/en/assessments/clock-drawing-test-cdt/

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