Table 1 Demographic characteristics of persons with polymyositis or dermatomyositis and comparison patients (n = 9731).
Variables | Patients with polymyositis/dermatomyositis (n = 1622) | Propensity score-matched comparison patients (n = 8109) | P value | ||
|---|---|---|---|---|---|
Total no | % | Total no | % | ||
Age, mean (SD) | 50.6 (15.7) | 50.7 (15.8) | 0.841 | ||
Males | 674 | 41.6 | 3369 | 41.6 | 0.996 |
Monthly income | 0.989 | ||||
< NT$1–15,841 | 342 | 21.1 | 1699 | 21.0 | |
NT$15,841–25,000 | 660 | 40.7 | 3314 | 40.9 | |
≥ NT$25,001 | 620 | 38.2 | 3096 | 38.2 | |
Geographic region | 0.931 | ||||
Northern | 626 | 38.6 | 3151 | 38.9 | |
Central | 455 | 28.0 | 2269 | 28.0 | |
Southern | 509 | 31.4 | 2548 | 31.4 | |
Eastern | 32 | 2.0 | 141 | 1.7 | |
Urbanization level | 0.998 | ||||
1 (most urbanized) | 470 | 29.0 | 2340 | 28.9 | |
2 | 488 | 30.1 | 2415 | 29.8 | |
3 | 290 | 17.9 | 1461 | 18.0 | |
4 | 220 | 13.6 | 1109 | 13.7 | |
5 (least urbanized) | 154 | 9.5 | 784 | 9.7 | |
Hypertension | 842 | 51.9 | 4210 | 51.9 | 0.996 |
Coronary heart disease | 463 | 28.6 | 2315 | 28.6 | 0.998 |
Diabetes | 491 | 30.3 | 2454 | 30.3 | 0.995 |
