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Table 2 Productivity, physical functioning, and health-related quality of life at baseline as assessed by WPS-RA, HAQ-DI, and SF-36

From: Discriminant validity, responsiveness and reliability of the rheumatoid arthritis-specific Work Productivity Survey (WPS-RA)

  All randomly assigneda
(n = 220)
  Number Mean (SD) Median
WPS-RAb    
   Number of days of work missed (absenteeism) 85 2.2 (5.85) 0
   Number of days with productivity = 50% at work (presenteeism) 85 5.9 (8.56) 2
   Rate of arthritis interference with work productvityc 85 4.5 (2.50) 5
   Number of days of household work missed 220 9.2 (9.84) 5
   Number of days with productivity = 50% in household work 219 11.2 (10.00) 10
   Number of days of family, social, or leisure activities missed 220 4.0 (6.74) 2
   Number of days with outside help 217 1.2 (4.29) 0
   Rate of arthritis interference with household work productvityc 216 5.8 (2.75) 5.5
HAQ-DI 219 1.5 (0.64) 1.5
SF-36 PCS 216 27.88 (7.84) 27.51
SF-36 MCS 216 44.71 (11.46) 45.28
  1. aModified intent-to-treat population; bWork Productivity Survey – Rheumatoid Arthritis (WPS-RA) recall period is 1 month; cscore on a scale of 0 to 10 points (0 = no interference and 10 = complete interference). HAQ-DI, Health Assessment Questionnaire – Disability Index; SD, standard deviation; SF-36, Short Form-36 health survey; SF-36 MCS, Short Form-36 health survey – Mental Component Summary; SF-36 PCS, Short Form-36 health survey – Physical Component Summary.