Comparison 1. Tramadol versus no treatment or placebo.
Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
---|---|---|---|---|
1.1 All‐cause mortality during initial hospitalization | 1 | 71 | Risk Ratio (M‐H, Fixed, 95% CI) | 0.32 [0.01, 7.70] |