8 weeks postpartum, for women who had planned to
breastfeed. The odds ratios in Column 4 are all well over 1,
while the odds ratios in Column 5 are all well below 1; the
differences between the two are statistically significant at
the 1 % level or better for the first six measures of
breastfeeding, and significant at the 5 % level for the
remaining measure. The effects are smaller for later
assessment periods. At 8 and 21 months, the odds ratios in
Column 5 are lower than the odds ratios in Column 4 in
almost all cases; however, the differences are not statistically
significant. At 33 months, the differences are larger
again, and are significant at the 1 % level for three of the
seven measures of breastfeeding.