Table 1.
General Characteristics of Participants.
| Characteristics | Total participants | ||
|---|---|---|---|
| Rheumatoid arthritis (n, %) | Control (n, %) | P-value | |
| Age (years old) | 1.000 | ||
| 20–24 | 176 (2.6) | 704 (2.6) | |
| 25–29 | 281 (4.2) | 1,124 (4.2) | |
| 30–34 | 382 (5.7) | 1,528 (5.7) | |
| 35–39 | 509 (7.6) | 2,036 (7.6) | |
| 40–44 | 667 (10.0) | 2,668 (10.0) | |
| 45–49 | 914 (13.7) | 3,656 (13.7) | |
| 50–54 | 1,059 (15.8) | 4,236 (15.8) | |
| 55–59 | 828 (12.4) | 3,312 (12.4) | |
| 60–64 | 767 (11.5) | 3,068 (11.5) | |
| 65–69 | 548 (8.2) | 2,192 (8.2) | |
| 70–74 | 339 (5.1) | 1,356 (5.1) | |
| 75–79 | 168 (2.5) | 672 (2.5) | |
| 80–84 | 49 (0.7) | 196 (0.7) | |
| 85+ | 8 (0.1) | 32 (0.1) | |
| Sex | 1.000 | ||
| Male | 1,569 (23.4) | 6,276 (23.4) | |
| Female | 5,126 (76.6) | 20,504 (76.6) | |
| Income | 1.000 | ||
| 1 (lowest) | 1,077 (16.1) | 4,308 (16.1) | |
| 2 | 979 (14.6) | 3,916 (14.6) | |
| 3 | 1,195 (17.8) | 4,780 (17.8) | |
| 4 | 1,516 (22.6) | 6,064 (22.6) | |
| 5 (highest) | 1,928 (28.8) | 7,712 (28.8) | |
| Region of residence | 1.000 | ||
| Urban | 2,952 (44.1) | 11,808 (44.1) | |
| Rural | 3,743 (55.9) | 14,972 (55.9) | |
| Hypertension | 2,829 (42.3) | 11,316 (42.3) | 1.000 |
| Diabetes | 1,387 (20.7) | 5,548 (20.7) | 1.000 |
| Dyslipidemia | 2,272 (33.9) | 9,088 (33.9) | 1.000 |
| Depression | 859 (12.8) | 2,740 (10.2) | <0.001* |
| CCI (score) | <0.001* | ||
| 0 | 2,061 (30.8) | 11,988 (44.8) | |
| 1 | 1,036 (15.5) | 3,602 (13.5) | |
| ≥2 | 3,598 (53.7) | 11,190 (41.8) | |
| Asthma ≥2 times | 1,095 (16.4) | 3,469 (13.0) | <0.001* |
| Asthma ≥3 times | 786 (11.7) | 2,435 (9.1) | <0.001* |
| Asthma ≥4 times | 626 (9.4) | 1,862 (7.0) | <0.001* |
| Asthma ≥5 times | 500 (7.5) | 1,477 (5.5) | <0.001* |
*Chi-square test or Fisher’s exact test. Significance at P < 0.05.
CCI: Charlson Comorbidity Index.