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Table 3 Adjusted prevalence and prevalence ratios of supine sleep position among 3-month-old infants using hierarchical model of analysis

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

Hierarchical levels and variables Prevalence % (95%CI)* PR (95%CI)*
Level 1
 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)
Level 2
 Family income (quintiles)   p < 0.001
  Q1 44.2 (40.6–47.9) 1.00 (Ref.)
  Q2 53.7 (50.1–57.2) 1.21 (1.09–1.35)
  Q3 58.2 (54.7–61.7) 1.32 (1.19–1.46)
  Q4 56.1 (52.8–59.4) 1.27 (1.15–1.40)
  Q5 66.1 (62.5–69.6) 1.49 (1.35–1.65)
Level 3
 Maternal age   p < 0.001
  ≤18 38.5 (33.2–43.9) 1.00 (Ref.)
  19–24 50.0 (46.9–53.1) 1.29 (1.11–1.51)
  25–30 56.7 (53.8–59.6) 1.47 (1.27–1.71)
  31–36 63.7 (60.7–66.8) 1.65 (1.42–1.92)
  ≥37 61.9 (56.8–67.1) 1.61 (1.36–1.89)
Maternal cohabitation with a partner   p = 0.060
 No 51.0 (46.1–55.8) 1.00 (Ref.)
 Yes 56.2 (54.5–57.8) 1.10 (1.00–1.22)
Level 4
 Who advised on infant sleep position   p < 0.001
  Nobody 44.5 (42.0–46.9) 1.00 (Ref.)
  Child’s father or grandparents 34.6 (26.4–42.9) 0.77 (0.61–0.99)
  Physician 63.5 (61.0–65.9) 1.43 (1.33–1.54)
  Other health care professional 66.2 (62.5–70.0) 1.49 (1.38–1.61)
  Other 72.0 (64.7–79.3) 1.62 (1.44–1.81)
Level 5
 Bed sharing at 3 months of age   p < 0.001
  Yes 49.2 (46.8–51.7) 1.00 (Ref.)
  No 59.0 (56.9–61.1) 1.20 (1.12–1.27)
  1. 95%CI: 95% confidence interval; PR prevalence ratio
  2. *Adjusted for all variables of superior levels and of the same level