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Table 3 Convergent validity: Spearman rank-order correlation coefficients between WPAI domains and criterion measures of health-related quality of life

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

  WPAI Domain
Criterion Measure Absenteeism Presenteeism Overall Work Impairment Activity Impairment
SIBDQ
Bowel symptoms −0.47 −0.68 − 0.68 −0.55
Systemic symptoms −0.13 −0.31 − 0.31 −0.46
Emotional function −0.15 −0.40 − 0.38 −0.49
Social function −0.36 −0.64 − 0.63 −0.68
Median correlation −0.26 −0.52 − 0.51 −0.52
SF-12v2
Physical functioning −0.22 − 0.28 − 0.28 −0.35
Role physical −0.38 −0.57 − 0.57 −0.50
Bodily pain −0.52 −0.54 − 0.54 −0.55
General health −0.07 −0.15 − 0.12 −0.34
Vitality −0.33 −0.31 − 0.31 −0.44
Social functioning −0.37 −0.35 − 0.36 −0.44
Role emotional −0.35 −0.46 − 0.46 −0.41
Mental health −0.18 −0.17 − 0.17 −0.33
Median correlation −0.34 −0.33 − 0.34 −0.43
  1. SF-12v2 SF-12v2 Health Survey, SIBDQ Short Inflammatory Bowel Disease Questionnaire, WPAI Work Productivity and Activity Impairment questionnaire
  2. Note: all data in this table are from Yarlas et al (2015a) [36]
  3. Values printed in BOLD indicate correlations satisfying the definition of convergent validity (≥|0.40|) [24]