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Table 4 Convergent/discriminant validity and known-groups validity of the SF-36v2 scales and summary scores (N = 387)

From: Performance of the Dutch SF-36 version 2 as a measure of health-related quality of life in patients with rheumatoid arthritis

  Spearman correlations at 6 month Mean (SD) scores across levels of disease activity at 6 months
  HAQ-DI PGA TJC SJC ESR Low disease activity Moderate-high F(1, 331) P
  (n = 378) (n = 338) (n = 338) (n = 338) (n = 337) (DAS28 ≤3.2) disease activity   
       (n = 232) (n = 101)   
PF −0.76 −0.49 −0.36 −0.17 −0.13 73.56 (23.29) 52.87 (23.51) 55.18 <0.001
RP −0.58 −0.54 −0.32 −0.19 0.02 65.46 (26.24) 43.19 (24.18) 53.11 <0.001
BP −0.64 −0.65 −0.44 −0.29 −0.09 70.86 (18.39) 47.58 (17.28) 116.89 <0.001
GH −0.43 −0.46 −0.24 −0.05 −0.08 63.41 (18.46) 48.85 (17.85) 44.60 <0.001
VT −0.47 −0.47 −0.21 −0.06 −0.05 63.47 (19.10) 50.19 (18.51) 34.67 <0.001
SF −0.51 −0.45 −0.24 −0.10 −0.01 83.73 (20.06) 69.93 (22.58) 30.83 <0.001
RE −0.47 −0.44 −0.13 −0.05 −0.04 75.32 (26.20) 58.66 (29.20) 26.52 <0.001
MH −0.34 −0.32 −0.13 −0.05 −0.00 77.84 (17.99) 70.00 (20.00) 12.49 <0.001
PCS −0.71 −0.58 −0.44 −0.24 −0.12 45.77 (8.40) 36.48 (7.45) 91.97 <0.001
MCS −0.33 −0.34 −0.07 −0.00 −0.05 50.72 (10.51) 46.16 (12.05) 12.07 0.001
  1. PF, Physical functioning; RP, Role-physical; BP, Bodily pain; GH, General health; VT, Vitality; SF, Social functioning; RE, Role-Emotional; MH, Mental health; HT, Health transition; PCS, Physical component summary; MCS, Mental component summary; HAQ-DI, Health assessment questionnaire disability index; PGA, Patient global assessment of well-being; visual analog scale for general health; TJC, Tender joint count; SJC, Swollen joint count; ESR, Erythrocyte sedimentation rate.