Objective: The Stroop test Çapa version does not have normative data, despite its extensive use in clinical and research settings to assess executive functions. The aim of the present study was to test the validity and reliability of the Stroop test Çapa version and to establish stratified normative data in individuals aged between 18-83 years.
Method: The norm determination phase of the study included 541 healthy participants, stratified by age, education, and gender. The relative contributions of the demographic variables on the completion times of Stroop subtests were assessed with multiple linear regression analysis. The main effects of age, education and gender variables and of interactions between these on the completion times of subtests were investigated with 6x3x2 ANOVA design. In addition, the concurrent validity, test-retest reliability and internal consistency of the test were examined.
Results: Multiple linear regression models that included age and education accounted for 23-42% of the completion time variances of all subtests. In the factorial ANOVA, main effects, as well as interaction effects of age and education were found on all subtests. For all Stroop subtests, the completion times were the shortest for the individuals in the 18-29 age group with the highest education level and longest for the individuals in the 70-83 age group with the lowest education level. The test demonstrated acceptable internal consistency and high test-retest reliability.
Conclusion: Normative data of the Stroop Test Çapa Version were provided for the assessment of executive functions in young and middleaged adults and elderly population.