Table 1 Characteristics of early rheumatoid arthritis patients, early arthritis patients with other arthritides, and asymptomatic volunteers
Rheumatoid arthritis (n = 195) | Arthritis patients with other arthritides (n = 159) | Asymptomatic volunteers (n = 193) | |
|---|---|---|---|
Female, n (%) | 119 (66) | 80 (52) | 136 (70) |
Age, mean (SD) | 55.9 (14.6) | 54.3 (17.2) | 50.7 (26.4) |
Symptom duration (months), median (IQR) | 3.2 (1.8–6.8) | 3.0 (1.0–6.2) | – |
Current smokers, n (%) | 38 (24) | 29 (23) | 17 (9) |
BMI (kg/m2), median (IQR) | 26.4 (23.7–29.4) | 25.5 (22.9–27.9) | 24.1 (22.3–26.3) |
WHO BMI classification, n (%) | |||
Low-normal weight (BMI 18.5–24.9 kg/m2) (%) | 75 (38) | 66 (42) | 115 (60) |
Overweight (BMI 25.0–29.9 kg/m2) (%) | 79 (41) | 70 (44) | 61 (32) |
Obesity (BMI ≥ 30 kg/m2) (%) | 41 (21) | 23 (14) | 17 (9) |
CRP (mg/L), median (IQR) | 9.8 (3.7–23.0) | 4.0 (3.0–15.1) | NA |
ACPA positivity, n (%) | 107 (55) | 6 (4) | NA |
RF positivity, n (%) | 120 (62) | 27 (17) | NA |