Factor	Odds ratio (95% CI)
Increase SIDS risk
Bed sharing, smoking mother 8	13.90 (9.58 to 20.09)
Birth before 37 weeks' gestation9	11.67 (1.84 to 74.14)
Soft bedding material6	5.10 (3.10 to 8.30)
Prone sleeping position (versus back)5	4.92 (3.62 to 6.58)
Prone sleeping position (versus any other position)5	4.30 (3.39 to 5.39)
Bed sharing, nonsmoking mother 8	2.09 (0.98 to 4.39)
Cigarette smoking during pregnancy 9	2.03 (1.16 to 3.54)
Parental unemployment9	1.72 (1.11 to 2.66)
Postnatal exposure to cigarette smoke10	1.65 (1.20 to 2.28)
Side sleeping position (versus back)5	1.36 (1.03 to 1.80)
Reduce SIDS risk
Immunizations up to date11	0.54 (0.39 to 0.76)
Pacifier use4	0.39 (0.31 to 0.50)