Table 1. Distribution of studied patients according to their characters, smoking, BMI categories, currently used biological therapy, and a family history of RF.
Ex-smoker; no longer smoking, RF; rheumatoid factor, RA; rheumatoid arthritis
| Variable | No. (%) | |
| Age | <40 | 98 (9.3) |
| 40 - <50 | 87 (26) | |
| 50 - <60 | 762 (22.7) | |
| ≥60 | 74 (22.1) | |
| Gender | Male | 51 (15.2) |
| Female | 284 (84.8) | |
| For females | Pregnancy | |
| Yes | 7 (2.5) | |
| No | 277 (97.5) | |
| Previous abortion | ||
| Yes | 21 (7.4) | |
| No | 263 (92.6) | |
| Nationality | Saudi | 218 (65.1) |
| Non- Saudi | 117 (34.9) | |
| Smoking | Yes | 51 (15.2) |
| No | 274 (81.8) | |
| Ex-smoker | 10 (3) | |
| BMI categories | Underweight | 6 (1.8) |
| Normal | 56 (16.7) | |
| Over | 74 (22.1) | |
| Obesity | 108 (32.2) | |
| Severe obesity | 91 (27.2) | |
| Current biological therapy | Monotherapy | 300 (89.6) |
| Two types | 21 (6.3) | |
| Three types | 14 (4.2) | |
| Family history of RA | Yes | 64 (19.1) |
| No | 271 (80.9) | |
| RF | Yes | 144 (43) |
| No | 182 (54.3) | |
| Not applicable | 9 (2.7) | |