Non-linear relationship between platelet count and 30-day in-hospital mortality in ICU patients with acute myocardial infarction: a multicenter retrospective cohort study.

The robustness of these non-linear relationships was confirmed by likelihood ratio tests comparing two-piecewise versus standard linear models, which were highly significant across all populations (Model I: P < 0.001; Model II: P < 0.001; Model III: P = 0.002; Model IV: P = 0.043).

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