Incidence rates and hazard ratios (HR) for associations between PM/DM and death according to sub-group
| Polymyositis | Dermatomyositis | |||||||
|---|---|---|---|---|---|---|---|---|
| 1997–2004 | 2005–2012 | 1997–2004 | 2005–2012 | |||||
| PM Cohort | Non-PM Cohort | PM Cohort | Non-PM Cohort | DM Cohort | Non-DM Cohort | DM Cohort | Non-DM Cohort | |
| Overall | 115.0 | 464.0 | 268.0 | 1072.0 | 79.0 | 324.0 | 250.0 | 1000.0 |
| Number of deaths | 56.0 | 51.0 | 50.0 | 55.0 | 42.0 | 36.0 | 40.0 | 46.0 |
| Mean follow-up time (person-years) | 2.2 | 3.8 | 2.5 | 3.2 | 1.9 | 3.6 | 2.8 | 3.4 |
| Death rate (deaths per 1000 person-years) | 226.1 | 28.9 | 73.3 | 16.2 | 287.0 | 31.0 | 56.9 | 13.5 |
| Fully adjusted HR (95% CI)* | 5.6 (3.2–9.9) | 1 (ref) | 3.1 (1.8–5.3) | 1 (ref) | 8.0 (4.0–16.0) | 1 (ref) | 2.9 (1.7- 5.2) | 1.0 (ref) |
| Men | 53.0 | 216.0 | 106.0 | 424.0 | 33.0 | 132.0 | 80.0 | 320.0 |
| Number of deaths | 25.0 | 35.0 | 23.0 | 23.0 | 19.0 | 21.0 | 20.0 | 25.0 |
| Mean follow-up time (person-years) | 2.1 | 3.8 | 2.4 | 3.1 | 1.7 | 3.7 | 2.8 | 3.6 |
| Death rate (deaths per 1000 person-years) | 228.2 | 42.3 | 89.0 | 17.3 | 329.1 | 42.8 | 90.8 | 21.8 |
| Fully adjusted HR (95% CI)* | 4.0 (1.8–9.0) | 1 (ref) | 2.9 (1.3–6.8) | 1 (ref) | 10.9 (3.7–31.8) | 1 (ref) | 3.7 (1.4–9.8) | 1 (ref) |
| Women | 62.0 | 248.0 | 162.0 | 648.0 | 46.0 | 192.0 | 170.0 | 680.0 |
| Number of deaths | 31.0 | 16.0 | 27.0 | 32.0 | 23.0 | 15.0 | 20.0 | 21.0 |
| Mean follow-up time (person-years) | 2.2 | 3.8 | 2.6 | 3.2 | 1.9 | 3.5 | 2.8 | 3.3 |
| Death rate (deaths per 1000 person-years) | 224.4 | 17.0 | 63.7 | 15.4 | 259.5 | 22.3 | 41.5 | 9.2 |
| Fully adjusted HR (95% CI)* | 9.6 (4.1–22.5) | 1 (ref) | 3.6 (1.8–7.4) | 1 (ref) | 7.4 (2.9–18.8) | 1 (ref) | 2.6 (1.3–5.3) | 1 (ref) |