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TABLE 1

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

NZCDSGeSIDCIMSScottishECASCESDISWISSIrishPooled
Any breastfeeding, mo 
Never 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 
>0–2 0.79 (0.55–1.13) 0.70 (0.48–1.02) 0.43 (0.28–0.65) 0.65 (0.41–1.05) 0.56 (0.36–0.88) 0.61 (0.46–0.81) 0.79 (0.37–1.67) 0.68 (0.51–0.92) 0.61 (0.54–0.69) 
>2–4 0.49 (0.33–0.71) 0.18 (0.13–0.25) 0.07 (0.03–0.21) 0.16 (0.06–0.47) 0.21 (0.13–0.33) 0.42 (0.28–0.64) 0.42 (0.16–1.12) 0.16 (0.09–0.29) 0.26 (0.22–0.30) 
>4–6 0.32 (0.19–0.53) 0.10 (0.06–0.16) 0.06 (0.01–0.51) 0.20 (0.04–0.90) 0.20 (0.12–0.33) 0.39 (0.20–0.78) 0.15 (0.02–1.40) 0.04 (0.01–0.26) 0.18 (0.14–0.23) 
>6 0.19 (0.09–0.37) 0.15 (0.10–0.25) Undefined Undefined 0.07 (0.03–0.14) 0.25 (0.09–0.70) 0.11 (0.01–0.95) 0.22 (0.07–0.72) 0.13 (0.10–0.18) 
Exclusive breastfeeding, mo 
Never 1.00 1.00 1.00 1.00 1.00 Not available Not available 1.00 1.00 
>0–2 0.88 (0.58–1.34) 0.40 (0.28–0.56) 0.46 (0.28–0.76) 0.63 (0.39–1.03) 0.98 (0.73–1.32) 0.40 (0.28–0.58) 0.61 (0.53–0.71) 
>2–4 0.41 (0.27–0.64) 0.22 (0.15–0.33) 0.18 (0.02–1.51) 0.21 (0.06–0.73) 0.29 (0.21–0.41) 0.12 (0.05–0.30) 0.25 (0.20–0.30) 
4–6 0.32 (0.10–1.03) 0.13 (0.09–0.20) Undefined Undefined 0.19 (0.12–0.31) 0.48 (0.16–1.41) 0.16 (0.12–0.21) 
NZCDSGeSIDCIMSScottishECASCESDISWISSIrishPooled
Any breastfeeding, mo 
Never 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 
>0–2 0.79 (0.55–1.13) 0.70 (0.48–1.02) 0.43 (0.28–0.65) 0.65 (0.41–1.05) 0.56 (0.36–0.88) 0.61 (0.46–0.81) 0.79 (0.37–1.67) 0.68 (0.51–0.92) 0.61 (0.54–0.69) 
>2–4 0.49 (0.33–0.71) 0.18 (0.13–0.25) 0.07 (0.03–0.21) 0.16 (0.06–0.47) 0.21 (0.13–0.33) 0.42 (0.28–0.64) 0.42 (0.16–1.12) 0.16 (0.09–0.29) 0.26 (0.22–0.30) 
>4–6 0.32 (0.19–0.53) 0.10 (0.06–0.16) 0.06 (0.01–0.51) 0.20 (0.04–0.90) 0.20 (0.12–0.33) 0.39 (0.20–0.78) 0.15 (0.02–1.40) 0.04 (0.01–0.26) 0.18 (0.14–0.23) 
>6 0.19 (0.09–0.37) 0.15 (0.10–0.25) Undefined Undefined 0.07 (0.03–0.14) 0.25 (0.09–0.70) 0.11 (0.01–0.95) 0.22 (0.07–0.72) 0.13 (0.10–0.18) 
Exclusive breastfeeding, mo 
Never 1.00 1.00 1.00 1.00 1.00 Not available Not available 1.00 1.00 
>0–2 0.88 (0.58–1.34) 0.40 (0.28–0.56) 0.46 (0.28–0.76) 0.63 (0.39–1.03) 0.98 (0.73–1.32) 0.40 (0.28–0.58) 0.61 (0.53–0.71) 
>2–4 0.41 (0.27–0.64) 0.22 (0.15–0.33) 0.18 (0.02–1.51) 0.21 (0.06–0.73) 0.29 (0.21–0.41) 0.12 (0.05–0.30) 0.25 (0.20–0.30) 
4–6 0.32 (0.10–1.03) 0.13 (0.09–0.20) Undefined Undefined 0.19 (0.12–0.31) 0.48 (0.16–1.41) 0.16 (0.12–0.21) 
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