Reference ranges of the WHO Disability Assessment Schedule (WHODAS 2.0) score and diagnostic validity of its 12-item version in identifying altered functioning in healthy postpartum women

Abstract

Objectives: To compare scores on the 36-item WHO Disability Assessment Schedule 2.0 tool (WHODAS-36) for postpartum women across a continuum of morbidity and to validate the 12-item version (WHODAS-12). Methods: This is a secondary analysis of the Brazilian retrospective cohort study on long-term repercussions of severe maternal morbidity. We determined mean, median, and percentile values for WHODAS-36 total score and for each domain, and percentile values for WHODAS-12 total score in postpartum women divided into three groups: “no,” “nonsevere,” and “severe” morbidities. Results: The WHODAS-36 mean total scores were 11.58, 18.31, and 19.19, respectively for no, nonsevere, and severe morbidity. There was a dose-dependent effect on scores for each domain of WHODAS-36 according to the presence and severity of morbidity. The diagnostic validity of WHODAS-12 was determined by comparing it with WHODAS-36 as a “gold standard.” The best cut-off point for diagnosing dysfunctionality was the 95th percentile. Conclusion: The upward trend of WHODAS-36 total mean value scores of women with no morbidity compared with those with morbidity along a severity continuum may reflect the impact of morbidity on postpartum functioning.