Characteristics and results of the medical charts retrieved for sampling in the study.

*P<0.05;

**P<0.01;

***P<0.001: chi-square test for percentages of categorical factors of expected numbers >5, Fisher's exact test for percentages of categorical factors of expected numbers <5, student t test for average hospital stay.

Including medical, surgical, pediatric intensive care unit and obstetric special units (the tocolytic unit and delivery room).

Average hospital stay of the patients corresponding to the medical charts retrieved for sampling.