From: Comparison of intensive care unit mortality performances: standardized mortality ratio vs absolute risk reduction
ICU
SMR, 95% CI
ARR, 95% CI
Medical
0.76, 0.70–0.82
4.7%, 3.1–6.3
Mixed
0.61, 0.54–0.68
6.3%, 4.7–7.9
Surgical
0.48, 0.41–0.
4.7%, 3.7–5.7