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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