Table 2A.

Test-retest reliability of candidate measures of at-work limitations/productivity (presenteeism) from the first of our 2 test-retest reliability studies: MID/PAS study. Adapted from Tang, et al. J Rheumatol 2014;41:165–763.

Study 1: MID/PAS Study
InstrumentContent Sourcen (stable)*Mean Baseline Score (SD)Mean 2-week FollowupICC2,1
Global measures
  WPS (item 4)Item 4 from the Rheumatoid Arthritis-specific Work Productivity Survey353.7 (3.0)3.7 (3.4)0.87
  WPAI (item 5)Item 5 from the Work Productivity and Activity Impairment Questionnaire (specific health problem version)343.9 (3.0)3.4 (2.9)0.84
  QQ methodMultiplication of 2 items (E1 and E2) from the Productivity and Disease Questionnaire (ProDISQ)3361.2 (33.3)57.6 (34.2)0.77
WAI (item 1)Item 1 from the Work Ability Index67.5 (2.1)6.7 (2.5)0.80
Multiitem measures
  WALSWorkplace Activity Limitations Scale (12 items)3712.5 (7.3)12.2 (8.0)0.93
  WLQ-25 PDmodWork Limitations Questionnaire-25; (4 subscales: TM = time management [5 items], PD = physical demands [6 items], MI = mental interpersonal [9 items], OD = output demands [5 items]); Index score = weighted sum of subscales37TM = 36.5 (28.2)TM = 34.2 (26.5)TM = 0.93
37PD = 47.1 (32.9)PD = 42.6 (32.9)PD = 0.95
37MI = 25.6 (23.4)MI = 27.0 (24.6)MI = 0.79
34OD = 34.4 (28.9)OD = 32.5 (31.6)OD = 0.86
34Index = 9.6 (7.6)Index = 9.3 (7.8)Index = 0.93
  • * No change on an external anchor fielded at 2-week followup (compared to when you completed the first questionnaire package, how would you rate your ability to do your usual work activities? 0 = much worse, 5 = no change, 10 = much better);

  • ‡: The WAI was added to the study at a later date, allowing only small accrual. Results should be taken with caution;

  • WLQ-25 physical demands subscale (PD) was modified in this study — instruction for the PD subscale was reoriented to be consistent with the other subscales. WPAI: Work Productivity and Activity Impairment Questionnaire; WPS: Arthritis-specific Work Productivity Survey; QQ: Quantity and Quality Method; WAI: Work Ability Index; WALS: Workplace Activity Limitations Scale; WLQ-25 PDmod: Work Limitations Questionnaire with modified physical demands scale; ICC2,1: intraclass correlation coefficient, type 2,1.