Odds ratios for serious adverse events during hospital admission in admitted patients and within 30 days in discharged patients*
| Outcome | No. (%) of patients | OR† (95% CI)‡ | |
|---|---|---|---|
| Admitted to hospital n = 658 | Discharged n = 658 | ||
| Serious adverse event | 133 (20.2) | 32 (4.9) | 5.0 (3.3–7.4) |
| Death (due to unknown and known cause) | 8 (1.2) | 8 (1.2) | 1.0 (0.4–2.7) |
| Ventricular arrhythmia | 10 (1.5) | 5 (0.8) | 2.0 (0.7–6.0) |
| Death or ventricular arrhythmia | 17 (2.6) | 12 (1.8) | 1.4 (0.7–3.0) |
| Nonfatal arrhythmia | 74 (11.2) | 15 (2.3) | 5.1 (2.9–8.8) |
| Nonarrhythmic serious condition§ | 47 (7.1) | 8 (1.2) | 6.3 (2.9–13.5) |
Note: CI = confidence interval, OR = odds ratio.
↵* Among the 1316 matched emergency department patients with syncope.
↵† Calculated by logistic regression analysis within the matched cohort.
↵‡ Clustering among matched pairs was taken into account when calculating standard errors.
↵§ Described in Appendix 2.