Table 4. Independently associated factors for viral pneumonia in patients with community-acquired pneumonia.

Risk Factor	Logistic regression analysis without variable selection				Logistic regression analysis with backward conditional variable selection
	OR	95% CI		P value	OR	95% CI		P value
		Lower	Upper			Lower	Upper
Rhinorrhea	3.59	1.59	8.10	0.002	3.52	1.58	7.87	0.002
Lymphocyte %	1.01	0.98	1.04	0.436
Creatinine	0.63	0.39	1.02	0.629
GGO	4.35	2.27	8.34	<0.001	4.68	2.46	8.89	<0.001

GGO: ground glass opacity.