Table 3. Multivariable logistic regression of the geometric mean titer for EV-A71 and CV-A16 seropositive individuals.

Variable	EV-A71	P value	CV-A16	P value
	OR (95% CI)		OR (95% CI)
Month of specimen collection
January	0.6 (0.5–0.9)	0.004	0.5 (0.4–0.7)	<0.001
April	1.3 (1.0–1.9)	0.08	1.0 (0.7–1.4)	0.93
August	Reference		Reference
Place of specimen collection
Jinan	0.7 (0.5–1.0)	0.04	0.9 (0.7–1.2)	0.53
Jining	1.1 (0.8–1.5)	0.55	1.5 (1.1–2.0)	0.01
Zibo	Reference		Reference