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TABLE 2

Stratified and Pooled Multivariable ORs (95% CIs) of SIDS for Duration of Any Breastfeeding

Duration, moNZCDSGeSIDCIMSScottishECASCESDISWISSIrishPooled Model 1a (n = 3386)Pooled Model 2b (n = 5008)Pooled Model 3c (n = 6121)Pooled Model 4d (n = 7842)
Never 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 
>0–2 0.86 (0.53–1.40) 0.89 (0.49–1.63) 0.69 (0.36–1.31) 0.69 (0.31–1.52) 0.79 (0.25–2.51) 0.96 (0.65–1.40) 0.12 (0.01–2.18) 1.13 (0.59–2.17) 0.91 (0.68–1.21) 0.90 (0.72–1.12) 0.83 (0.69–1.01) 0.83 (0.70–0.99) 
>2–4 0.67 (0.40–1.11) 0.51 (0.29–0.88) 0.16 (0.04–0.71) 0.38 (0.09–1.54) 0.82 (0.25–2.73) 0.78 (0.45–1.34) 0.02 (<0.001–0.93) 0.19 (0.07–0.51) 0.60 (0.44–0.82) 0.62 (0.48–0.80) 0.52 (0.41–0.65) 0.46 (0.37–0.56) 
>4–6 0.39 (0.19–0.80) 0.37 (0.18–0.74) 0.16 (0.01–1.72) 0.20 (0.03–1.57) 0.94 (0.23–3.94) 0.64 (0.24–1.75) <0.001 (<0.001–3.50) 0.08 (0.01–0.86) 0.40 (0.26–0.63) 0.42 (0.29–0.61) 0.38 (0.27–0.54) 0.40 (0.30–0.53) 
>6 0.44 (0.17–1.13) 0.30 (0.15–0.63) Undefined Undefined 0.06 (0.00–0.94) 0.26 (0.05–1.25) 0.001 (<0.001–1.71) 0.45 (0.06–3.09) 0.36 (0.22–0.61) 0.34 (0.22–0.54) 0.33 (0.21–0.50) 0.25 (0.17–0.37) 
Duration, moNZCDSGeSIDCIMSScottishECASCESDISWISSIrishPooled Model 1a (n = 3386)Pooled Model 2b (n = 5008)Pooled Model 3c (n = 6121)Pooled Model 4d (n = 7842)
Never 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 
>0–2 0.86 (0.53–1.40) 0.89 (0.49–1.63) 0.69 (0.36–1.31) 0.69 (0.31–1.52) 0.79 (0.25–2.51) 0.96 (0.65–1.40) 0.12 (0.01–2.18) 1.13 (0.59–2.17) 0.91 (0.68–1.21) 0.90 (0.72–1.12) 0.83 (0.69–1.01) 0.83 (0.70–0.99) 
>2–4 0.67 (0.40–1.11) 0.51 (0.29–0.88) 0.16 (0.04–0.71) 0.38 (0.09–1.54) 0.82 (0.25–2.73) 0.78 (0.45–1.34) 0.02 (<0.001–0.93) 0.19 (0.07–0.51) 0.60 (0.44–0.82) 0.62 (0.48–0.80) 0.52 (0.41–0.65) 0.46 (0.37–0.56) 
>4–6 0.39 (0.19–0.80) 0.37 (0.18–0.74) 0.16 (0.01–1.72) 0.20 (0.03–1.57) 0.94 (0.23–3.94) 0.64 (0.24–1.75) <0.001 (<0.001–3.50) 0.08 (0.01–0.86) 0.40 (0.26–0.63) 0.42 (0.29–0.61) 0.38 (0.27–0.54) 0.40 (0.30–0.53) 
>6 0.44 (0.17–1.13) 0.30 (0.15–0.63) Undefined Undefined 0.06 (0.00–0.94) 0.26 (0.05–1.25) 0.001 (<0.001–1.71) 0.45 (0.06–3.09) 0.36 (0.22–0.61) 0.34 (0.22–0.54) 0.33 (0.21–0.50) 0.25 (0.17–0.37) 
a

Model 1 controlled for sleep position at last sleep, maternal smoking during pregnancy, bed-sharing in the last sleep (infant sleeping with another person on the same surface), room-sharing in the last sleep (infant sleeping in the same room as an adult caregiver but on a separate surface), dummy or pacifier in the last sleep, maternal age, prenatal care, marital status, parity, maternal education, SES, infant age, infant sex, admission to a special care infant unit, season at death, birth weight, gestational age, multiple pregnancy, and cesarean delivery.

b

Model 2 controlled for variables in model 1, except for cesarean delivery, to include the CESDI and SWISS studies.

c

Model 3 controlled for variables in model 2, except season and SES, to include the ECAS and Irish studies.

d

Model 4 controlled for variables in model 3, except for antenatal care and maternal education, to include the Scottish study.

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