Characteristic | General Population Controls, n = 24,800 | RA, n = 5560 | p |
---|---|---|---|
Female | 17,834 (71.9) | 4069 (73.2) | 0.06 |
Age at diagnosis, yrs, mean (SD) | 53.4 (17.9) | 54.1 (17.6) | 0.0082 |
Duration of followup from the index date, yrs, mean (SD) | 8.69 (5.9) | 8.85 (5.7) | 0.066 |
Region of residence | |||
Urban | 13,195 (56.1) | 3123 (56.2) | 0.066 |
Rural | 10,885 (43.9) | 2437 (43.8) | |
Socioeconomic status | |||
Rural 1, lowest rural | 2215 (8.93) | 565 (10.2) | 0.0015 |
Rural 2 | 2186 (8.81) | 502 (9.03) | |
Rural 3 | 2406 (9.70) | 514 (9.24) | |
Rural 4 | 2172 (8.76) | 461 (8.29) | |
Rural 5, highest rural | 1730 (6.98) | 369 (6.64) | |
Urban 1, lowest urban | 2912 (11.7) | 685 (12.3) | |
Urban 2 | 3020 (12.2) | 721 (13.0) | |
Urban 3 | 3012 (12.1) | 660 (11.8) | |
Urban 4 | 2613 (10.5) | 541 (9.73) | |
Urban 5, highest urban | 2042 (8.23) | 469 (8.43) | |
Not calculated* | 492 (1.98) | 73 (1.31) | |
Modified Charlson Comorbidity Index | |||
0 | 23,020 (92.3) | 4762 (85.6) | < 0.0001 |
1 | 521 (2.10) | 477 (8.58) | |
> 1 to 3 | 1004 (4.05) | 275 (4.95) | |
> 3 to 5 | 107 (0.43) | 25 (0.45) | |
> 5 | 148 (0.60) | 21 (0.38) |
↵* People living where the Canadian census does not calculate an average household income, most of whom reside in nursing homes or other chronic care facilities. RA: rheumatoid arthritis.