Table 2 Relationship between quality control indicators and hospital stay.

Rates (n%)	1–10 days	11–20 days	21–30 days	≥ 31 days	P for trend
Proportion of ICU patient bed occupancy to total inpatient bed occupancy					0.02
< 1	36.22	36.75	16.03	11.00
1~	36.73	35.11	15.01	13.15
1.5~	34.18	36.36	15.72	13.74
2~	32.82	34.37	16.81	16.00
2.5	36.21	34.62	15.07	14.10
Proportion of ICU patients with APACHE II score ≥ 15					0.99
< 50	36.50	34.77	14.75	13.98
50~	36.22	34.36	14.67	14.75
60~	31.85	36.57	18.25	13.32
70~	37.37	34.57	14.51	13.55
80~	34.36	36.78	16.77	12.09
Microbiology detection rate before antibiotic use					< 0.05
< 60	36.75	35.53	14.37	13.34
60~	38.47	34.66	14.59	12.27
70~	35.42	37.63	15.42	11.53
80~	35.86	35.09	15.82	13.23
90~	34.62	34.70	16.11	14.57

ICU, intensive care unit; APACHE, acute physiology and chronic health evaluation.

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