Table 2.

Multivariate analysis of predictors of upper respiratory colonization of S. pneumonia in healthy preschool children in following seasons.

Predictors	Autumn		Winter		Spring
	OR (95% CI)	P	OR (95% CI)	P	OR (95% CI)	P
Age			0.75 (0.5–1.0)	0.08	0.6 (0.5–0.8)	0.003
DCC attendance	2.5 (1.3–4.9)	0.005	2.1 (1.1–4.0)	0.02	2.6 (1.4–4.8)	0.001
RTIs			1.9 (1.1–3.5)	0.03
Number of Ab courses			0.5 (0.3–0.8)	0.002
Type of Ab	1.0	0.04

DCC: day care center; RTIs: respiratory tract infections; Ab: antibiotic.