Trends in socioeconomic inequalities in risk of sudden infant death syndrome, other causes of infant mortality, and stillbirth in Scotland: population based study.

Nevertheless, when we compared the association between deprivation category and sudden infant death syndrome in 1992-6, 1997-2002, and 2003-8, the adjusted odds ratios when smoking was included with the other maternal characteristics were 2.24 (0.65 to 3.37), 3.32 (1.78 to 6.18), and 0.60 (0.29 to 1.29), respectively, and the variation over these three epochs was also highly significant (P=0.002 for interaction).

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