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Table 1 Patient characteristics of the arthritis cohorts and controls

From: Body mass index distribution in rheumatoid arthritis: a collaborative analysis from three large German rheumatoid arthritis databases

  CAPEA RABBIT NDB Reference (DEAS)
N 1033 12,230 3424 6202
Age (years), mean (SD) 56.6 (14.2) 56.2 (9.7) 61.5 (13.7) 61.5 (12.1)
Sex (female), n (%) 660 (63.9) 9328 (76.3) 2611 (76.3) 3072 (49.5)
Disease duration (weeks or years), mean (SD) 12.6 w (7.2) 9.9 y (9.1) 13.5 y (10.6) NA
CRP (mg/l), mean (SD) 19.7 (30.3) 18.2 (26.6) 11.0 (5.2) NA
DAS28, mean (SD) 5.1 (1.3) 5.2 (1.3) 3.1 (1.2) NA
BMI (kg/m2), mean (SD) 27.0 (5.0) 26.7 (5.3) 26.5 (4.9) 26.6 (4.2)
  < 18.5, n (%) 11 (1.1) 263 (2.2) 56 (1.6) 45 (0.8)
 18.5 to <25, n (%) 372 (36.4) 4810 (39.3) 1416 (41.4) 2264 (37.5)
 25 to <30, n (%) 396 (38.8) 4294 (35.1) 1219 (35.6) 2624 (43.5)
  ≥ 30, n (%) 243 (23.8) 2863 (23.4) 733 (21.4) 1099 (18.2)
  1. BMI body mass index, CRP C-reactive protein, DAS28 Disease Activity Score, NA not applicable, SD standard deviation, w weeks, y years