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