Table 2. Univariable analysis of VAP patients who received mechanical ventilation in the modeling group.

Factors	Case number	VAP case	Incidence rate (%)	χ2	P
Gender				0.009	0.923
Male	450	53	11.78
Female	458	53	11.57
Age (years old)				5.198	0.023
<60	411	37	9.00
≥60	497	69	13.88
ICU length of stay (d)				4.169	0.041
≤9	487	47	9.65
>9	421	59	14.01
Length of ventilator use (d)				11.795	0.001
≤8	526	45	8.56
>8	382	61	15.97
Operation				1.328	0.249
Yes	230	22	9.57
No	678	84	12.39
Disorders of consciousness				11.089	0.001
Yes	231	41	17.75
No	677	65	9.60
Frequency of oral care (per day)				50.56	<0.001
<3	219	55	25.11
≥3	689	51	7.40
Chronic disease				15.506	<0.001
Yes	750	102	13.60
No	158	4	2.53
Subglottic secretion drainage				4.636	0.031
Yes	525	51	9.71
No	383	55	14.36
Tracheotomy				4.978	0.026
Yes	139	24	17.27
No	769	82	10.66
APACHE II score				3.888	0.049
<15	616	63	10.23
≥15	292	43	14.73
Combined antibiotics use				12.07	0.001
Yes	670	93	13.88
No	238	13	5.46
Antacids use				11.908	0.001
Yes	518	77	14.86
No	390	29	7.44

VAP, ventilator-associated pneumonia; ICU, intensive care unit; APACHE, acute physiology and chronic health evaluation.