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Table 2 Prevalence and crude prevalence ratios of supine sleep position among 3-month-old infants

From: Prevalence and associated factors of supine sleep position in 3-month-old infants: findings from the 2015 Pelotas (Brazil) Birth Cohort

Characteristics Prevalence % (95%CI) PR (95%CI)
Infant’s sex   p = 0.341
 Male 54.6 (52.5–56.8) 1.00 (Ref.)
 Female 56.1 (53.9–58.3) 1.03 (0.97–1.09)
Maternal skin color   p < 0.001
 Black 47.7 (43.8–51.5) 1.00 (Ref.)
 Brown 48.6 (44.3–52.8) 1.02 (0.90–1.15)
 White 58.4 (56.6–60.2) 1.23 (1.12–1.34)
Family income (quintiles)   p < 0.001
 Q1 43.4 (39.9–47.0) 1.00 (Ref.)
 Q2 53.2 (49.7–56.7) 1.23 (1.10–1.36)
 Q3 57.8 (54.4–61.3) 1.33 (1.20–1.47)
 Q4 56.5 (53.2–59.8) 1.30 (1.18–1.44)
 Q5 67.5 (64.0–71.0) 1.55 (1.41–1.71)
Maternal education (years of schooling)   p < 0.001
 0–4 42.5 (37.4–47.6) 1.00 (Ref.)
 5–8 44.9 (41.9–47.9) 1.06 (0.92–1.21)
 9–11 56.1 (53.5–58.6) 1.32 (1.16–1.50)
 ≥12 67.0 (64.4–69.5) 1.58 (1.39–1.79)
Maternal age   p < 0.001
 ≤18 36.2 (31.5–40.8) 1.00 (Ref.)
 19–24 48.5 (45.6–51.4) 1.34 (1.16–1.54)
 25–30 57.4 (54.6;60.2) 1.59 (1.38–1.82)
 31–36 65.9 (62.9–68.8) 1.82 (1.59–2.08)
 ≥37 63.8 (58.7–68.9) 1.76 (1.52–2.05)
Parity   p = 0.172
 ≥5 51.6 (43.8–59.4) 1.00 (Ref.)
 4 53.8 (46.6–61.0) 1.04 (0.83–1.27)
 3 59.4 (54.9–63.9) 1.15 (0.97–1.36)
 2 56.6 (53.8–59.3) 1.09 (0.93–1.28)
 1 54.1 (51.9–56.3) 1.05 (0.90–1.23)
Maternal cohabitation with a partner   p < 0.001
 No 44.9 (40.8–48.9) 1.00 (Ref.)
 Yes 57.1 (55.4–58.7) 1.27 (1.16–1.40)
Who advised on infant sleep position   p < 0.001
 Nobody 43.1 (40.7–45.4) 1.00 (Ref.)
 Child’s father or grandparents 31.8 (24.5–39.2) 0.74 (0.58–0.94)
 Physician 66.3 (63.8–68.7) 1.54 (1.44–1.64)
 Other healthcare professional 65.1 (61.5–68.7) 1.51 (1.40–1.63)
 Other 74.2 (66.3–82.0) 1.72 (1.53–1.94)
Breastfeeding at 3 months*   p = 0.132
 No 53.2 (50.0–56.4) 1.00 (Ref.)
 Yes 56.0 (54.3–57.8) 1.05 (0.98–1.13)
Bed sharing at 3 months of age   p < 0.001
 Yes 46.1 (43.8–48.3) 1.00 (Ref.)
 No 62.1 (60.0–64.1) 1.35 (1.27–1.43)
  1. 95%CI: 95% confidence interval; PR prevalence ratio
  2. n = 4108