Reliability and validity of the Brazilian version of the world health organization disability assessment schedule (WHODAS 2.0) questionnaire for women with urinary incontinence

Abstract

Purpose To analyze the reliability and validity of the WHODAS 2.0 instrument for women with urinary incontinence (UI). Methods This is a methodological study with Brazilian women with complaints of urge, stress or mixed UI, over 18 years old, without cognitive disorders. The WHODAS 2.0 (36-item version) and the auxiliary instruments were applied through face-to-face and telephone interviews after 7–14 d. The psychometric properties evaluated were: Cronbach’s alpha for internal consistency, intraclass correlation coefficient (ICC) for intra-rater test-retest, Spearman’s correlation coefficient (rho) for construct validity of WHODAS 2.0 with auxiliary instruments; and ANOVA for discriminative validity with UI severity. Results 101 women with UI with a mean age of 50.71 ± 10.39 were included. WHODAS 2.0 showed good reliability in all domains and excellent reliability in the total score (>0.80). The intra-evaluator test-retest showed ICC values between 0.59 and 0.87 (p < 0.001). We observed a positive correlation between the WHODAS 2.0 domains and the instruments recommended by International Continence Society (ICS), with greater emphasis on moderate correlation with the Urinary Impact Questionnaire (IUQ-7) subscale (rho = 0.730 p < 0.001). Conclusion The WHODAS 2.0 instrument is a reliable and valid questionnaire for investigating the functioning and disability of women with UI.