Odds ratios for myocardial infarction associated with symptoms of respiratory infection starting in the preceding month
| Symptom | Cases (n = 119) | Controls (n = 214) | Unadjusted analysis* | Adjusted analysis† | p Value | ||
|---|---|---|---|---|---|---|---|
| OR | 95% CI | OR | 95% CI | ||||
| *Except for the matching factors (age, sex, social class, calendar period). | |||||||
| †For the primary definition of infection: adjusted for history of angina and smoking status in addition to the matching factors; for chest pain on breathing and fever: adjusted for each other in addition to history of angina, smoking, and the matching factors. | |||||||
| CI, confidence interval; NA, not applicable; OR, odds ratio. | |||||||
| Primary definition | |||||||
| No | 98 (82%) | 182 (85%) | 1 | NA | 1 | NA | |
| Yes | 21 (18%) | 32 (15%) | 1.0 | 0.6 to 1.9 | 1.0 | 0.5 to 1.9 | 0.98 |
| Chest pain on breathing | |||||||
| No | 98 (82%) | 211 (99%) | 1 | NA | 1 | NA | |
| Yes | 21 (18%) | 3 (1%) | 17.8 | 4.1 to 77.2 | 17.5 | 3.6 to 85.6 | <0.0001 |
| Fever | |||||||
| No | 96 (81%) | 205 (96%) | 1 | NA | 1 | NA | |
| Yes | 23 (19%) | 9 (4%) | 4.1 | 1.9 to 9.0 | 5.9 | 2.0 to 16.8 | 0.0004 |