Fig. 7

Restricted cubic spline analysis and forest plot. A–G Association between continuous predictors and 72 h mortality in polytrauma patients post-admission. For each curve, five knots at the 5th, 35th, 50th, 65th, and 95th percentiles were chosen. Solid lines denote odds ratios, while shaded regions represent 95% CIs. The cutoff point is the value nearest to or equal to the odds ratio at 1. H Adjusted odds ratios for categorical variables transformed from continuous ones based on cutoff points derived from the restricted cubic spline analysis. BMI body mass index, GCS galsgow coma scale, ISS injury severity score, BE base excess, OR odds ratio, CI confidence interval