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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.