Table 4 Standardised mortality ratio (SMR), mean and (95% CI)
From: Non-randomised patients in a cholecystectomy trial: characteristics, procedures, and outcomes
0 – 90 days | 91 – 365 days | ||||
|---|---|---|---|---|---|
N | Deaths | SMR | Deaths | SMR | |
Trial patients | 724 | 1 | 1.61 (0.02 – 3.46) | 3 | 0.62 (0.13 – 1.78) |
Non-randomised patients | 993 | 23 | 3.42 (2.17 – 5.13) | 26 | 1.27 (0.90–1.86) |