Table 1.
Characteristics of 813 patients with incident rheumatoid arthritis (RA) in Olmsted County, Minnesota 1980–2007 by time period of RA incidence
| Variable | 1980–1994 (n=349) | 1995–2007 (n=464) | p-value |
|---|---|---|---|
|
| |||
| Age, years, mean ±SD | 56.3 ± 15.9 | 55.6 ± 15.5 | 0.44 |
|
| |||
| Female | 236 (68) | 320 (69) | 0.68 |
|
| |||
| Length of follow-up, years, mean ± SD | 14.6 ± 7.2 | 5.9 ± 3.5 | |
|
| |||
| Smoking | <0.001 | ||
|
| |||
| current | 98 (28) | 80 (17) | |
|
| |||
| former | 116 (33) | 155 (33) | |
|
| |||
| Rheumatoid factor positive | 231 (66) | 306 (66) | 0.94 |
|
| |||
| Obesity (BMI ≥30 kg/m2) | 111 (32) | 210 (45) | <0.001 |
| Medication use by 5 years after RA incidence date* | |||
| Methotrexate | 98 (30) | 284 (64) | <0.001 |
| Hydroxychloroquine | 141 (42) | 290 (64) | <0.001 |
| Other DMARDs | 125 (37) | 92 (23) | <0.001 |
| Biologic response modifiers | 0 (0) | 80 (20) | <0.001 |
| Corticosteroids | 173 (51) | 361 (81) | <0.001 |
*
Percentages estimated using Kaplan-Meier methods. Comparison performed using logrank test.