Healthcare Master Case Study Baum, C.M., Et Case Study

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Healthcare Master Case Study

Baum, C.M., et al. (2008). Reliability, Validity, and Clinical Utility of the Executive Function Performance Test: A Measure of Executive Function in a Sample of People With Stroke The American Journal of Occupational Therapy 62 (4); pg 446.

Study rationale. The research study is designed to assess the validity and reliability of a test for executive function in post-stroke occupational therapy patients. Clinical tests of executive function may not be good predictors of a patient's ability to function in day-to-day life. The Executive Function Performance Test (EFPT) employs ordinary daily living skills in which the post-stroke patients are likely to have engaged in the past, and are reasonable target behaviors for adaptation to independent or supported living arrangements. The test is particularly valuable in that it offers a convenient test for executive function using real-world tasks.

Research design. An experimental design is employed in this study. A control group is used to assess the utility and sensitivity of the EFPT to degrees of stroke-related dysfunction. Data collected in the study was quantitative and was analyzed using statistical procedures. Three hypotheses were identified prior to the commencement of the actual research.

Distinguishing characteristics of EFPT. The EFPT administration protocol seems easy to learn. A manual is provided that articulates how test administrators are to present the four tasks, cue the patients, and score their behavior. The four distinct tasks are designed to elicit behaviors that will isolate cognitive components of the executive functions activated during task completion -- these findings will later help to determine a course of therapy or treatment. The EFPT promotes top-down objective assessment of executive function as demonstrated through the performance of real-world tasks. This aspect of the test avoids the pitfalls of predictive behavior based on contrived or proxy task performance. Also, on a very practical level, the test provides specific information about support or assistance needs of the patients with regard to their near future performance of the four tasks.

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Research variables. The independent variables were age, gender, race, and educational level of the study participants. Level of impairment at 6 months post-stroke as measured by their admission score on the National Institutes of Health Stroke Scale was another important independent variable. The level of dysfunction post-stroke was operationalized by creating three groups of participants: A control group, a mild stroke group, and a moderate stroke group. The dependent variables were subjects' scores on the EFPT, scores on the neuropsychological tests, and the scores on the functional outcome tests.

Reliability measures. Reliability refers to consistency across test (measurement) repetitions. For a test to be reliable, it must good test-retest results and good internal consistency. Interrater reliability was assessed by having three trained raters simultaneously score the task performance of a number of study participants, and calculating intraclass correlation coefficients (ICC). To test for internal consistency, Cronbach's alpha correlation was used to check all possible combinations for correlation. A Pearson's correlation coefficients were calculated for the relationship between each of the test domains and the total test score. In all instances, reliability measures were in the high acceptable range.

Validity measures. Validity is the estimate of the strength of research with regard to the conclusions drawn. There are four types of validity: Conclusion, external, internal and construct. Construct validity refers to the accuracy with which a method actually measures what it is designed to measure. Significant differences between the post-stroke patients and an age-matched control group are expected to indicate that the test demonstrates the discriminative validity (within the larger category of construct validity), in that, scores that are anticipated to not be related do not, in fact, show correlation.

Significant differences were found among the three groups for the total scores, tasks, and executive functions, except for initiation. Only the cooking subtest was found not to discriminate between the mild and moderate participants. Concurrent validity was assessed by comparing the scores….....

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