Characteristics of selected features in the external validation group.

<p>Definition of abbreviations: y: Years; TPN: Total parenteral nutrition; CVC: Central venous catheter; WBC: White blood cell; PCT: Procalcitonin; CRP: C-reactive protein; ICU: Intensive care unit; IQR: Interquartile range; SD: Standard deviation; *The t-test for metric variable if data are normally distributed; **the Chi-square test (big sample size) and Fisher’s exact test (small sample size) for categorical variables; ***the Mann–Whitney U-test for metric variables if data are not normally distributed.</p> <p>(DOCX)</p>