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Table 4 Convergent validity: Correlations between WPAI domains and criterion measures of disease activity

From: Psychometric validation of the work productivity and activity impairment questionnaire in ulcerative colitis: results from a systematic literature review

  WPAI Domain
Study Criterion Measure Absenteeism Presenteeism OWI Activity Impairment
Jackson 2016 [38] SCCAI 0.76 0.85 0.83
Mandel 2014 [32] Partial Mayo score 0.45 0.51 0.60 0.37
Yarlas 2014 [41] UC-DAI 0.32 0.34 0.42 0.43
Median correlation 0.39 0.51 0.60 0.43
  1. OW, Overall Work Impairment; SCCAI Simple Clinical Colitis Activity Index; UC-DAI Ulcerative Colitis – Disease Activity Index; WPAI Work Productivity and Activity Impairment questionnaire
  2. -- Value not reported
  3. Values printed in BOLD indicate correlations satisfying the definition of convergent validity (≥|0.40|) [24]