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Table 2 Prevalence and risk ratio of infant supine sleep; WIC vs. non-WIC mothers, 2007–2010, MA PRAMS

From: Using surveillance data to inform a SUID reduction strategy in Massachusetts

Year sample size (n w) WIC mothers (n w) Non-WIC mothers (weighted (n w) Risk ratio (95% CI)* P-value
2007 70,782 26,462 44,320 0.75 (0.68-0.82) .0001
2008 70,456 25,605 44,851 0.78 (0.71-0.85) .0001
2009 67,874 26,050 41,824 0.85 (0.79-0.91 .0001
2010 67,140 24,831 42,309 0.85 (0.79-0.93) .0001
Aggregate (2007–2010) 276,252 102,948 173,304 0.81 (0.77-0.84) .0001
  1. nw: Weighted sample size.
  2. *Reference group: non-WIC mothers.