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The adjusted incidence rate ratios comparing the total number of URTI and AOM episodes at ages 0 to 6 years in children with and without day care in the first year of life and according to age at entry (no daycare in the first year is the reference group). Adjustments were made for: gender, parental education level, older siblings and duration of exclusive breastfeeding. AOM, acute otitis media; URTI, upper respiratory tract infection.
