TABLE 2

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

Breastfeeding Behavior and OutcomeHazard Ratio (95% Confidence Interval)
CrudeMutually Adjusteda
Predominant
 Noninitiation1.01 (0.78–1.30)1.00 (0.76–1.31)
 Cessation at 6 wk0.76 (0.63–0.93)0.79 (0.64–0.97)
 Cessation at 4 mo0.79 (0.67–0.93)0.83 (0.69–0.99)
Any0.68 (0.47–0.99)0.75 (0.50–1.11)
 Noninitiation
 Cessation at 6 wk0.66 (0.52–0.84)0.70 (0.54–0.90)
 Cessation at 3 mo0.71 (0.58–0.88)0.73 (0.59–0.91)
 Cessation at 6 mo0.71 (0.60–0.82)0.73 (0.62–0.86)
 Cessation at 9 mo0.75 (0.66–0.85)0.79 (0.70–0.91)
  • a Mutually adjusted for maternal education, smoking, BMI, delivery mode, age, nationality, and first parity.