Fig. 4

Forest plots for the other most frequently mentioned risk factors (> 10 articles). a Sensitivity analysis for COPD as a dichotomous variable; b Sensitivity analysis for time from injury to operation as a continuous variable (per hour increase); c Forest plot for time from injury to operation as a dichotomous variable (≥48 h vs. < 48 h); d Sensitivity analysis after subgroup analysis of hypoalbuminemia as a dichotomous variable (hypoalbuminemia< 3.0 g/L vs. ≥3.0 g/L and hypoalbuminemia< 3.5 g/L vs. ≥3.5 g/L)