Table 2. Correlation of demographic and risk factors in VAP and Non-VAP patients by univariate analysis.

SN	Variable	Total cases (n = 244)	Non-VAP (n = 57)		VAP (n = 187)		Chi-square
1.	Mean age±SD (Range)	46.85± 18.13 (19–89)	49.25±17.93 (19–82)		46.08±18.18 (19–89)		1.132	0.259
			n	%	n	%	χ2	‘p’
2.	Age (Years)
	18–25	35	7	12.7	28	16.3	2.101	0.717
	26–40	60	12	21.8	48	27.9
	41–60	75	20	36.4	55	32.0
	61–80	51	15	27.3	36	20.9
	>80	6	1	1.8	5	2.9
3.	Sex
	Females	79	26	47.3	53	30.8	4.975	0.026
	Male	148	29	52.7	119	69.2
4.	Smoking	86	17	30.9	69	40.1	1.501	0.220
5.	Alcohol	41	9	16.4	32	18.6	0.141	0.707
6.	Diabetes	30	7	12.7	23	13.4	0.015	0.902
7.	Hypertension	81	18	32.7	63	36.6	0.276	0.599
8.	Liver disease	18	6	10.9	12	7.0	0.883	0.347
9.	Lung disease	39	7	12.7	32	18.6	1.012	0.314
10.	Renal disease	22	8	14.5	14	8.1	1.954	0.162
11.	Neurological	11	2	3.6	9	5.2	0.230	0.631
12.	Surgery	109	18	32.7	91	52.9	6.799	0.009
13.	Tracheostomy	68	13	23.6	55	32.0	1.382	0.240
14.	Heart disease	13	6	10.9	7	4.1	3.611	0.057
15.	CPIa Score ≥6	186	15	27.3	171	99.4	146.569	<0.001
16.	Previous Antibiotic history	62	12	6.7	50	29.1	30.421	<0.001

^aCPI score- Clinical pulmonary infection Score.