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Table 4 WPAI outcomes between two patient groups defined by the median for each health status outcome

From: Validity of the work productivity and activity impairment questionnaire - general health version in patients with rheumatoid arthritis

   Function Pain Pt global estimate Fatigue PtGA
Percent work time missed Better 4.2 (19.0) 1.5 (7.2) 2.0 (7.7) 3.9 (15.8) 1.6 (7.1)
  Worse 15.5 (31.5) 16.3 (34.0) 15.6 (33.9) 14.5 (32.4) 16.9 (34.6)
  Effect size 0.46 0.61 0.55 0.43 0.63
Percent impairment while working Better 14.5 (18.8) 11.6 (15.0) 10.9 (13.1) 12.8 (16.8) 11.7 (14.3)
  Worse 39.1 (20.1) 39.6 (21.1) 40.0 (21.7) 38.7 (21.0) 41.2 (21.0)
  Effect size 1.27 1.56 1.66 1.38 1.69
Percent overall work impairment Better 17.6 (24.8) 12.2 (16.7) 11.8 (15.7) 14.8 (22.1) 12.3 (16.1)
  Worse 46.5 (28.2) 47.4 (30.0) 47.2 (30.3) 46.0 (28.9) 48.9 (30.1)
  Effect size 1.10 1.46 1.48 1.22 1.55
Percent activity impairment Better 19.0 (21.1) 15.7 (17.0) 15.1 (17.0) 19.6 (21.0) 17.5 (19.0)
  Worse 52.7 (23.3) 51.9 (24.4) 52.0 (23.7) 49.9 (25.6) 51.9 (24.5)
  Effect size 1.53 1.73 1.79 1.30 1.58
  1. Pt global estimate, patient global estimate on health impact; PtGA, patient global assessment of disease activity
  2. If not indicated, t test P values <0.001; , t test P values <0.01; , t test P values <0.05
  3. Better status, ≤median; Worse status, >median. The median for each health status outcome was shown in Table 1