Age-adjusted standardized incidence ratio of Sjögren syndrome in female patients with dermatomyositis, stratified by age
| Age, yr | Dermatomyositis n = 1088 | Control n = 5501 | Rate ratio (95% CI) | ||
|---|---|---|---|---|---|
| No. (incidence)* | Follow-up† | No. (incidence) | Follow-up | ||
| 20–29 | 20 (26.19) | 763.67 | 22 (5.25) | 4188.25 | 4.99 (2.72–9.14) |
| 30–39 | 19 (19.94) | 953.08 | 19 (3.11) | 6110.75 | 6.41 (3.39–12.11) |
| 40–49 | 38 (24.74) | 1535.75 | 36 (4.29) | 8397.50 | 5.77 (3.66–9.11) |
| 50–59 | 31 (26.60) | 1165.25 | 26 (4.11) | 6327.25 | 6.47 (3.84–10.90) |
| 60–69 | 6 (9.24) | 649.67 | 13 (4.32) | 3008.58 | 2.14 (0.81–5.62) |
| ≥ 70 | 3 (11.14) | 269.42 | 2 (1.68) | 1193.00 | 6.64 (1.11–39.75) |
| Total | 117 (21.92) | 5336.83 | 118 (4.04) | 29225.33 | 5.43 (4.20–7.01) |
| Age-adjusted standardized incidence ratio | 5.42 (3.42–8.57) | ||||