TABLE 3

Crude and Mutually Adjusted Cox Proportional Hazard Ratios for Study Effect (2000–2001 UBCS vs 2012–2013 SPATZ) on Noninitiation and Cessation of Breastfeeding Stratified by Maternal Education

Breastfeeding Behavior and OutcomeHazard Ratio (95% Confidence Interval)
Less Education (<12 Years)More Education (≥12 Years)
CrudeMutually AdjustedaCrudeMutually Adjusteda
Predominant
 Noninitiation1.40 (1.02–1.92)1.09 (0.78–1.54)0.80 (0.52–1.24)0.86 (0.55–1.34)
 Cessation at 6 wk1.02 (0.79–1.30)0.81 (0.62–1.06)0.73 (0.52–1.02)0.80 (0.56–1.14)
 Cessation at 4 mo1.09 (0.87–1.35)0.92 (0.73–1.15)0.72 (0.54–0.95)0.76 (0.56–1.01)
Any
 Noninitiation0.91 (0.59–1.42)0.72 (0.45–1.17)0.68 (0.33–1.41)0.77 (0.36–1.63)
 Cessation at 6 wk0.88 (0.66–1.18)0.70 (0.51–0.95)0.67 (0.44–1.04)0.73 (0.47–1.14)
 Cessation at 3 mo0.92 (0.71–1.20)0.73 (0.55–0.96)0.74 (0.51–1.07)0.81 (0.56–1.19)
 Cessation at 6 mo0.98 (0.81–1.20)0.81 (0.66–1.00)0.66 (0.51–0.85)0.64 (0.49–0.83)
 Cessation at 9 mo0.93 (0.79–1.11)0.82 (0.68–0.98)0.79 (0.65–0.96)0.76 (0.62–0.93)
  • a Mutually adjusted for maternal smoking, BMI, delivery mode, age, nationality, and first parity.