Nonlinear relationship between platelet count and 30-day in-hospital mortality in ICU acute respiratory failure patients: a multicenter retrospective cohort study.

The log-likelihood ratio test yielded a highly significant result ( P < 0.001), indicating that the two-piecewise regression model provided a significantly better fit to the data than the standard linear regression model.

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The mortality rates decreased with increasing platelet count quartiles, with a significant trend observed ( P for trend < 0.0001).

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