Table 1 Demographic details of cases and controls.
| Cases (n = 154) | Controls (n = 870) | ||||
|---|---|---|---|---|---|
| N | % | N | % | Odds ratio (95% CI) | |
| Male | 64 | 41.6 | 359 | 41.3 | Matching variable |
| Age at adrenal crisis | |||||
| <15 | 10 | 6.5 | 58 | 6.7 | Matching variable |
| 15–24.9 | 6 | 3.9 | 47 | 5.4 | Matching variable |
| 25–34.9 | 18 | 11.7 | 103 | 11.8 | Matching variable |
| 35–44.9 | 24 | 15.6 | 133 | 15.3 | Matching variable |
| 45–54.9 | 25 | 16.2 | 140 | 16.1 | Matching variable |
| 55–64.9 | 19 | 12.3 | 106 | 12.2 | Matching variable |
| 65–74.9 | 30 | 19.5 | 169 | 19.4 | Matching variable |
| ⩾75 | 22 | 14.3 | 114 | 13.1 | |
| Smoking status | |||||
| Non‐smoker | 64 | 41.6 | 282 | 32.4 | Reference |
| Ex‐smoker | 7 | 4.5 | 31 | 3.6 | 0.9 (0.4 to 2.3) |
| Current smoker | 41 | 26.6 | 225 | 25.9 | 0.8 (0.5 to 1.2) |
| Missing | 42 | 27.3 | 332 | 38.2 | 0.4 (0.2 to 0.7) |
| Body mass index (kg/m2) | |||||
| Underweight (<18.5) | 5 | 3.2 | 12 | 1.4 | 2.1 (0.7 to 6.3) |
| Normal (18.5–24.9) | 52 | 33.8 | 233 | 26.8 | Reference |
| Overweight (25.0–29.9) | 25 | 16.2 | 156 | 17.9 | 0.7 (0.4 to 1.2) |
| Obese (>30) | 7 | 4.5 | 51 | 5.9 | 0.6 (0.3 to 1.4) |
| Missing | 65 | 42.2 | 418 | 48.0 | 0.6 (0.4 to 1.0) |
| Diagnosis of asthma or COPD | |||||
| Asthma | 32 | 20.8 | 90 | 10.3 | 2.4 (1.5 to 3.8) |
| COPD | 10 | 6.5 | 27 | 3.1 | 2.2 (1.0 to 4.7) |
| Asthma and COPD | 5 | 3.2 | 17 | 2.0 | 1.8 (0.6 to 5.2) |