Prevalence and Adjusted Odds of 6-Year-Old US Children Having at Least 2 Sick Visits to the Physician Within the Past 12 Months According to Breastfeeding Practices, IFPS II (2005–2007) and Y6FU (2012)

VariablePrevalence of ≥2 Sick VisitsOdds of ≥2 Sick Visits
NPercentaORa95% CI
Ever breastfed
P = .56b
Duration of any breastfeeding
 >0 to <3 mo30848.70Ref
 3 to <6 mo14135.460.60c0.39–0.92c
 6 to <9 mo13036.150.63c0.40–0.99c
 ≥9 mo50937.720.69c0.50–0.94c
P < .01c
Duration of exclusive breastfeeding
 >0 to < 4 mo85443.09Ref
 4 to <6 mo19232.810.68c0.48–0.97c
 ≥6 mo4219.050.33c0.15–0.75c
P < .01c
Formula supplementation
 Breastfed <6 mo with formula before 6 mo44044.55Ref
 Breastfed ≥6 mo with formula before 6 mo27941.940.960.69–1.32
 Breastfed ≥6 mo without formula before 6 mo36934.150.70c0.51–0.95c
P < .01c
Breast milk intensity (% milk feedings comprising breast milk) during the first 6 mo
 Low (>0 to < 33.3%)30748.53Ref
 Medium (33.3% to 66.6%)11737.610.670.43–1.05
 High (>66.6%)66437.050.67c0.50–0.91c
P < .01c
  • a aOR obtained after controlling for maternal age; race/ethnicity; education; household income; marital status; parity; Special Supplemental Nutrition Program for Women, Infants, and Children participation; prepregnancy BMI; infant gender and birth weight; infant cared for by someone other than parent at 3 months of age; infant attending after-school child care at 6 years of age; and type of school child attended. Reference group comprised children who had <2 sick visits during the past 12 months.

  • b P value from the χ2 test for the association between infant feeding practices and sick visit.

  • c If 95% CI does not include 1, the findings are considered statistically significant.