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Construct validity of the stroke-specific quality of life questionnaire in ischemic stroke patients
No full textDevelopment of a Computerized Adaptive Test for Assessing Activities of Daily Living in Outpatients With Stroke
No full textBackground. An efficient, reliable, and valid measure for assessing activities of daily living (ADL) function is useful to improve the efficiency of patient management and outcome measurement. ;Objective. The purpose of this study was to construct a computerized adaptive testing (CAT) system for measuring ADL function in outpatients with stroke. ;Design. Two cohort studies were conducted at 6 hospitals in Taiwan. ;Methods. A candidate item bank (44 items) was developed, and 643 outpatients were interviewed. An item response theory model was fitted to the data and estimated the item parameters (eg, difficulty and discrimination) for developing the ADL CAT. Another sample of 51 outpatients was interviewed to examine the concurrent validity and efficiency of the CAT. The ADL CAT, as the outcome measure, and the Barthel index (BI) and Frenchay Activities index (FAI) were administered on the second group of participants. ;Results. Ten items did not satisfy the model's expectations and were deleted. Thirty-four items were included in the final item bank. Two stopping rules (ie, reliability coefficient >.9 and maximum test length of 7 items) were set for the CAT. The participants' ADL scores had an average reliability of .93. The CAT scores were highly associated with those of the full 34 items (Pearson r=.98). The scores of the CAT were closely correlated with those of the combined BI and FAI (r=.82). The time required to complete the CAT was about one fifth of the time used to administer both the BI and FM. ;Limitations. The participants were outpatients living in the community. Further studies are needed to cross-validate the results. ;Conclusions. The results demonstrated that the ADL CAT is quick to administer, reliable, and valid in outpatients with stroke
DEVELOPMENT OF A COMPUTERIZED DIGIT VIGILANCE TEST AND VALIDATION IN PATIENTS WITH STROKE
No full textObjectives: To develop a computerized Digit Vigilance Test (C-DVT) with lower random measurement error than that of the DVT and to examine the concurrent validity, ecological validity, and test-retest reliability of the C-DVT in patients with stroke. ;Design: A cross-sectional study. ;Patients: Forty-four patients with stroke. ;Methods: We developed and tested the C-DVT. To examine the psychometric properties, the participants completed both the C-DVT and DVT twice with a 14-day interval. ;Results: We developed the C-DVT on the basis of expert input and examinee feedback. C-DVT scores were highly correlated with DVT scores (rho=0.75), supporting the concurrent validity. The C-DVT scores were moderately correlated with the scores of the Barthel Index and the Activities of Daily Living Computerized Adaptive Testing system (rho=-0.60 similar to-0.57), supporting the ecological validity. The test-retest agreement of the C-DVT was excellent (intra-class correlation coefficient=0.92). The random measurement error of the C-DVT (minimal detectable change percent change (MDC%)=15.4%) was acceptable and lower than that of the DVT (33.0%). The practice effects of the C-DVT were statistically significant, but the effect size d was small (0.15). ;Conclusion: A C-DVT with a limited amount of random measurement error was developed. These preliminary findings show that the C-DVT demonstrates satisfactory concurrent validity, ecological validity, and test-retest reliability in patients with stroke
Tests of data quality, scaling assumptions, reliability, and construct validity of the SF-36 health survey in people who abuse heroin
No full textBackground/Purpose: Health-related quality of life (HRQOL) is considered an important outcome indicator in substances abuse studies. However, psychometric properties of HRQOL measures are largely unknown in people who abuse heroin. Therefore, the present study aimed to examine data quality, scaling properties, reliability, and construct validity of the 36-Item Short Form healthy survey (SF-36) in people who abuse heroin. ;Methods: A total of 469 people who abuse heroin participated in the study. Data quality was determined by data completeness. Scaling properties were evaluated by item frequency distribution, equivalence of item means and standard deviations, item-internal consistency, and item-discriminant validity (calculating scaling success). Internal consistency was examined using Cronbach's alpha. Construct validity was examined by investigating convergent validity and divergent validity among the eight scales of the SF-36. ;Results: The results of data quality showed low missing rates (0.0-3.8%) and high completion rates in the scales (91.9-98.7%). The results of scaling assumptions showed good item frequency distribution on each item, roughly equivalent item means and standard deviations within a scale, good item-internal consistency (>0.4) and good scaling success rates (77.5-100%), except on the two scales of bodily pain (BP) and social functioning (SF). Three scales showed ceiling and/or floor effects [i.e., physical functioning (PF), role limitations due to physical problems (RP), and role limitations due to emotional problems (RE)]. Cronbach's a was acceptable (>0.7), except for the BP and SF scales. Construct validity was partially supported by the results of convergent validity and divergent validity. ;Conclusion: The results confirmed good data quality; satisfactory scaling assumptions and internal consistency (except for the BP and SF scales); and generally acceptable construct validity. However, the PF, RP, and RE scales showed ceiling and/or floor effects. Therefore, the BP, SF, PF, RP, and RE scales should be used with cautions in measuring HRQOL in people who abuse heroin. Copyright (C) 2012, Elsevier Taiwan LLC & Formosan Medical Association. All rights reserved
Test–Retest Reliability and Practice Effect of the Oral-format Symbol Digit Modalities Test in Patients with Stroke
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