Table 2.

Logistic regression analysis of P. aeruginosa infection risk variables in elderly individuals with CAP

Patient characteristics	Univariate logistic regression analysis		Multivariate logistic regression analysis
	Odds ratio (95%CI)	p-value	Odds ratio (95%CI)	p-value
Male	1.28 (0.71–2.31)	0.415
Chronic obstructive pulmonary diseases	1.67 (0.88–3.17)	0.117*	2.09 (0.80–5.48)	0.133
Bronchiectasis	4.14 (1.42–12.03)	0.005*	4.13 (1.28–13.34)	0.018‡
Chronic respiratory diseases (atelectasis, pulmonary fibrosis, and lung bleb)	3.62 (1.69–7.76)	0.001*	2.61 (1.05–6.44)	0.038‡
Tracheostomy before hospitalization	8.87 (1.92–40.87)	0.001*	1.13 (0.15–8.51)	0.903
Nasogastric tube feeding prior to admission	29.43 (3.83–225.85)	0.000*	40.68 (3.85–429.33)	0.002‡
Taking inhaled corticosteroids before hospitalization	1.79 (0.87–3.68)	0.111*	1.01 (0.35–2.88)	0.990
Receiving intravenous antimicrobials within the past 3 months	3.31 (1.63–6.74)	0.001*	0.90 (0.25–3.24)	0.871
History of hospitalization within the past 3 months	3.08 (1.65–5.77)	0.000*	1.63 (0.52–5.11)	0.402
Use of a ventilator in the last 3 months	3.79 (1.29–11.11)	0.010*	1.89 (0.44–8.13)	0.393
Receiving proton pump inhibitor before hospitalization	0.76 (0.35–1.62)	0.468
Malnutrition	1.99 (1.01–3.90)	0.045*	1.23 (0.51–2.98)	0.648
Bedridden	1.92 (0.93–3.99)	0.076*	0.91 (0.29–2.84)	0.864
Chronic heart failure	0.69 (0.22–2.19)	0.523
Cerebrovascular diseases	1.37 (0.67–2.80)	0.388
Chronic neurological disorders	1.25 (0.58–2.71)	0.572
Chronic kidney disease (GFR < 35 mL/min/1.73 m2)	0.65 (0.26–1.62)	0.348
Diabetes mellitus type 2	1.11 (0.59–2.09)	0.738
Immunocompromised status	4.20 (1.75–10.08)	0.001*	3.76 (1.23–11.51)	0.020‡
Alcohol drinking	0.17 (0.02–1.44)	0.050*	0.08 (0.00–3.91)	0.201
Smoking	0.84 (0.29–2.48)	0.757

^*P < 0.20 for univariate logistic regression analysis

^‡P < 0.05 for multivariate logistic regression analysis