Table 1.
Demographic and baseline disease characteristics*
| BMI <25 kg/m2 | 25≤ BMI <30 kg/m2 | 30≤ BMI <35 kg/m2 | BMI ≥35 kg/m2 | Total | Missing | |
|---|---|---|---|---|---|---|
| Female | 312 (68) | 260 (57) | 145 (67) | 65 (75) | 782 (63) | 0 |
| Age at symptom onset, median (IQR) years | 58 (44–71) | 59 (48–70) | 55 (44–67) | 49 (40–59) | 57 (46–69) | 83 |
| Symptom duration, median (IQR) weeks | 27 (18–46) | 28 (15–47) | 28 (19–51) | 33 (20–53) | 28 (17–48) | 83 |
| RF/anti-CCP antibody positive | 238 (64) | 231 (60) | 100 (52) | 48 (66) | 617 (61) | 227 |
| 2010 ACR/EULAR RA criteria positive | 241 (63) | 205 (56) | 138 (72) | 52 (72) | 636 (63) | 236 |
| 1987 ACR RA criteria positive | 190 (41) | 185 (40) | 97 (45) | 45 (51) | 517 (42) | 0 |
| DAS28, median (IQR) | 3.5 (2.6–4.5) | 3.4 (2.4–4.4) | 3.8 (2.9–4.9) | 4.2 (3.3–5.2) | 3.6 (2.6–4.6) | 244 |
| No. of comorbidities | 0 | |||||
| None | 316 (69) | 295 (64) | 118 (55) | 37 (43) | 766 (63) | – |
| 1–2 | 84 (18) | 102 (22) | 50 (23) | 27 (31) | 263 (22) | – |
| >2 | 58 (13) | 63 (14) | 48 (22) | 23 (26) | 192 (16) | – |
| Smoking status | 19 | |||||
| Never | 196 (43) | 177 (39) | 67 (32) | 43 (50) | 483 | – |
| Ever | 141 (31) | 187 (41) | 101 (48) | 34 (40) | 463 | – |
| Current | 115 (25) | 90 (20) | 43 (20) | 9 (10) | 257 | – |
| HAQ score, median (IQR) | 0.75 (0.25–1.375) | 0.75 (0.125–1.375) | 0.875 (0.312–1.562) | 1.375 (0.625–1.875) | 0.875 (0.25–1.5) | 0 |
| HAQ score groups | ||||||
| Group 1 (HAQ ≤0.375) | 159 (35) | 176 (38) | 62 (29) | 20 (23) | 417 (34) | – |
| Group 2 (0.375 < HAQ ≤1.25) | 170 (40) | 154 (33) | 80 (37) | 22 (25) | 326 (35) | – |
| Group 3 (HAQ 1.25) | 129 (28) | 130 (28) | 74 (34) | 45 (52) | 378 (31) | – |
| Total | 458 (38) | 460 (38) | 216 (18) | 87 (7) | 1,221 | 24† |
*
Values are the number (percentage of nonmissing data) unless indicated otherwise. BMI = body mass index; IQR = interquartile range; RF = rheumatoid factor; anti-CCP = anti–cyclic citrullinated peptide; ACR = American College of Rheumatology; EULAR = European League Against Rheumatism; RA = rheumatoid arthritis; DAS28 = Disease Activity Score in 28 joints; HAQ = Health Assessment Questionnaire.
†
These patients had missing BMI data.