Sensitivity analysis presenting number of identified idiopathic inflammatory myositis (IIM) cases and controls and corresponding ORs when varying latency time and excluding contributory diagnosis from the National Patient Register
| Exposed IIM cases (n=957) | Exposed controls (n=9476) | OR* (95% CI) | |
| Infections, n (%) | |||
| Main or contributory diagnosis, 1-year latency† | 125 (13) | 877 (9) | 1.5 (1.2 to 1.9) |
| Main diagnosis, 1-year latency | 104 (11) | 724 (8) | 1.5 (1.2 to 1.9) |
| Main or contributory diagnosis, 0-year latency | 181 (19) | 1081 (11) | 1.9 (1.6 to 2.2) |
| Main or contributory diagnosis, 3-year latency | 78 (11) | 547 (7) | 1.5 (1.2 to 1.9) |
| Respiratory tract disease, n (%) | |||
| Main or contributory diagnosis, 1-year latency† | 92 (10) | 423 (4) | 2.3 (1.8 to 3.0) |
| Main diagnosis, 1-year latency | 68 (7) | 334 (4) | 2.1 (1.6 to 2.8) |
| Main or contributory diagnosis, 0-year latency | 133 (14) | 526 (6) | 2.8 (2.3 to 3.4) |
| Main or contributory diagnosis, 3-year latency | 56 (8) | 256 (3) | 2.3 (1.7 to 3.1) |
*OR from conditional logistic regression.
†Definitions used in the main analyses. Only subjects with sufficient follow-up time included in the denominator when a latency period was included.