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Table 2 Incidence of URTI and AOM during the first six years of life by daycare attendance

From: Impact of early daycare on healthcare resource use related to upper respiratory tract infections during childhood: prospective WHISTLER cohort study

GP diagnosed URTI and AOM by daycare attendance Number of episodes Child-years Rate/100 child-years (95% CI) AdjustedaIRR (95% CI)
No daycare in first year 1,362 2,424.3 56.2 (53.3 to 59.2) 1.00
Day care in first year 4,334 7,325.2 59.2 (57.4 to 60.9) 1.08 (0.95 to 1.22)
 Age 0 to 2 months 629 1,104.4 56.9 (52.7 to 61.4) 1.05 (0.88 to 1.25)
 Age 3 to 5 months 2,967 5,081.0 58.4 (56.3 to 60.5) 1.06 (0.94 to 1.21)
 Age 6 to 12 months 738 1,139.8 64.8 (60.3 to 69.5) 1.18 (1.00 to 1.40)
  1. aAdjusted for: gender, parental education level, older siblings and duration of exclusive breastfeeding. AOM, acute otitis media; CI, confidence interval; GP, general practitioner; IRR, incidence rate ratio; URTI, upper respiratory tract infection.