Table 1.
Demographic characteristics of patients with RA by therapy history at time of enrollment into Corrona
| Characteristic | No identified RA-directed therapy N = 750 n (%) |
Prior RA-directed therapy N = 34,735 n (%) |
P valuea |
|---|---|---|---|
| Age (years), mean ± SD | 57.5 ± 14.7 | 58.1 ± 13.7 | 0.2104 |
| Gender (% female) | 567 (75.9%) | (76.40%) | 0.7520 |
| White | 613 (82.0%) | (82.50%) | 0.7100 |
| BMI | |||
| Mean ± SD | 29.5 ± 7.6 | 29.3 ± 7.2 | 0.3761 |
| Underweight/Normal | 215 (30.5%) | 9896 (29.5%) | 0.0320 |
| Overweight | 198 (28.1%) | 10,952 (32.7%) | |
| Obese | 291 (41.3%) | 12,671 (37.8%) | |
| Education (% college educated) | 304 (43.7%) | 18,157 (55.1%) | <0.0001 |
| Smoking status | |||
| Never | 439 (59.7%) | 20,415 (59.3%) | <0.0001 |
| Former | 149 (20.2%) | 8662 (25.2%) | |
| Current | 148 (20.1%) | 5353 (15.6%) | |
| Marital status (% married) | 470 (63.8%) | 22,110 (64.5%) | 0.6970 |
| Work status | |||
| Full time | 265 (36.0%) | 12,885 (37.3%) | 0.0010 |
| Part time | 74 (10.1%) | 3271 (9.5%) | |
| Disabled | 73 (9.9%) | 4269 (12.4%) | |
| Retired | 188 (25.5%) | 9419 (27.3%) | |
| Otherb | 136 (18.5%) | 4676 (13.6%) | |
| Insurancec | |||
| None | 34 (5.8%) | 684 (2.3%) | <0.0001 |
| Private | 420 (71.4%) | 21,822 (73.7%) | 0.2580 |
| Medicare | 154 (26.2%) | 10,230 (34.5%) | <0.0001 |
| Medicaid | 55 (9.9%) | 1909 (6.4%) | 0.0040 |
BMI body mass index, RA rheumatoid arthritis, SD standard deviation
a P value from Student’s two-sample two-sided t test (continuous variables) and Chi-squared test (categorical variables) comparing patients having no identified RA-directed therapy at time of enrollment to those with RA-directed therapies
b“Other” includes “at home” and “student” categories
cSum may not add up to total as some patients have more than one type of insurance