Table 1

Duration of exclusive breast feeding in Scandinavia among cases and controls with crude and adjusted odds ratios; the Nordic Epidemiological SIDS Study 1992–95

Duration of breast feedingCases nControls nOR95% CIp valueOR95% CIp value
Adjustment was made for smoking during pregnancy, paternal employment, sleeping position, and age of infant.
0–3 weeks7410210.46.0 to 17.8<0.0015.12.3 to 11.2<0.001
4–7 weeks561138.44.7 to 14.9<0.0013.71.6 to 8.40.002
8–11 weeks471495.23.0 to 9.3<0.0011.60.7 to 3.60.27
12–15 weeks271532.21.2 to 4.00.0122.81.2 to 6.80.021
16+ weeks353241.0ref.1.0ref.