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Table 3 Clinical characteristics by BMI categories

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

  CAPEA RABBIT NDB
BMI (kg/m2) <18.5 18.5 to <25 25 to <30 ≥30 <18.5 18.5 to <25 25 to <30 ≥30 <18.5 18.5 to <25 25 to <30 ≥30
Age (years), mean (SD) 58.8 (14.9) 54.2 (15.6) 58.2 (13.6) 57.8 (12.6) 49.8 (15.8) 54.3 (13.7) 58.1 (11.6) 57 (10.9) 59.9 (16.6) 59.7 (15.0) 63.4 (12.6) 61.5 (12.2)
Age at disease onset (years), mean 58.6 53.9 58.0 57.5 37.7 43.9 48.2 48.3 44,4 45,9 50,1 48,1
Disease duration (years), mean (SD) 0.2 0.3 0.2 0.3 12 (9.9) 10.4 (9.3) 9.9 (9.1) 8.8 (8.5) 15.5 (11.2) 13.8 (10.4) 13.3 (10.8) 13.4 (10.5)
Education, high (%) 40.0 21.4 16.4 13.3 22.4 21.7 14.3 11.8 28.3 27.9 18.6 15.7
Smoking, current (%) 63.6 36.3 32.3 27.6 30 24.2 20.7 18 35.7 22.4 19.8 13.8
Smoking, former (%) 9.1 23.9 28.0 39.1 12.9 20.9 25.4 28.7 16.7 25.1 30.9 36.3
RF positive (%) 45.5 55.4 49.8 46.9 73.3 74.7 71.6 66.4 72.2 72.4 69.9 72.3
DAS28, mean (SD) 5.9 (0.7) 4.9 (1.3) 5.1 (1.3) 5.2 (1.2) 5.2 (1.3) 5.1 (1.4) 5.2 (1.4) 5.3 (1.3) 3.0 (1.3) 3.0 (1.2) 3.1 (1.2) 3.4 (1.2)
SJC, mean (SD) 9.2 (5.8) 6.4 (5.5) 6.7 (5.7) 6.2 (5.1) 7.1 (5.5) 6.8 (5.6) 6.6 (5.6) 6.2 (5.5) 1.5 (2.4) 1.4 (2.6) 1.3 (2.7) 1.4 (3.1)
TJC, mean (SD) 10.5 (5.2) 9.7 (6.1) 10.4 (6.7) 10.7 (6.5) 8.7 (6.9) 8.7 (6.9) 9 (7) 9.4 (7.1) 1.7 (3.3) 2.0 (3.7) 1.9 (3.6) 2.3 (3.7)
PGA, mean (SD) 6.2 (2.3) 5.2 (2.3) 5.4 (2.3) 5.7 (2.1) 5.9 (2.2) 5.8 (2.1) 6 (2.1) 6.2 (2.1) 4.1 (2.7) 3.8 (2.2) 4.1 (2.2) 4.6 (2.2)
ESR, mean (mm/h) 42.8 (28.3) 31.5 (23.8) 31.9 (23.1) 35.7 (24.0) 32.6 (25.3) 30.2 (23.3) 31.5 (23.1) 32.2 (21.8) 18.2 (16.6) 18.0 (15.7) 19.1 (16.4) 23.1 (17.6)
CRP, mean (mg/l) 19.4 (34.3) 19.0 (34.5) 19.8 (26.5) 20.6 (29.2) 20.6 (29.9) 18.4 (27.9) 18.3 (26.1) 17.4 (24.8) 7.2 (9.8) 9.3 (65.2) 9.9 (50.8) 10.4 (17.9)
FFbH (0–100), mean (SD) 69.9 (17.8) 78.9 (19.0) 74.2 (21.5) 71.2 (21.0) 62.5 (24.7) 66.6 (22.9) 62.9 (23.2) 58.4 (23.1) 74.8 (25.5) 77.2 (23.1) 72.6 (24.0) 67.9 (24.4)
No. of comorbidities, mean (SD) 0.4 (0.5) 0.6 (1.0) 1.0 (1.3) 1.5 (1.6) 1.2 (1.6) 1.2 (1.5) 1.6 (1.7) 2.0 (1.7) 2.7 (2.3) 2.3 (2.1) 2.7 (2.2) 2.8 (2.2)
Prednisone equivalent in mg/day, mean (SD)* NA NA NA NA 5.3 (4.8) 5.1 (5.5) 5.1 (5.5) 5.3 (7.8) 5.9 (4.0) 4.8 (3.4) 4.8 (3.0) 5.2 (3.8)
  1. *Average daily dose in the last 6 months. In CAPEA, prior treatment with prednisone was not applicable (NA)
  2. BMI body mass index, ESR erythrocyte sedimentation rate, DAS28 Disease Activity Score, FFbH Hannover Functional Assessment, PGA Patient Global Assessment, SJC swollen joint count, TJC tender joint count, RF rheumatoid factor, SD standard deviation