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Table 1 Description of study sample according to characteristics collected at perinatal and 3-month follow-up

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

Characteristics n (%)
Infant’s sex
 Male 2076 (50.5)
 Female 2032 (49.5)
Maternal skin color
 Black 646 (15.9)
 Brown 527 (12.9)
 White 2902 (71.2)
Family income (quintiles)
 Q1 762 (19.7)
 Q2 778 (20.1)
 Q3 778 (20.1)
 Q4 869 (22.5)
 Q5 680 (17.6)
Maternal education (years of schooling)
 0–4 367 (8.9)
 5–8 1058 (25.8)
 9–11 1413 (34.4)
 ≥12 268 (30.9)
Maternal age (years)
 ≤18 417 (10.1)
 19–24 1156 (28.1)
 25–30 1198 (29.2)
 31–36 988 (24.1)
 ≥37 348 (8.5)
Parity
 ≥5 159 (3.9)
 4 186 (4.5)
 3 456 (11.1)
 2 1273 (31.0)
 1 2033 (49.5)
Maternal cohabitation with a partner
 No 584 (14.2)
 Yes 3523 (85.8)
Who advised on infant sleep position*
 Nobody 1706 (41.6)
 Child’s father or grandparents 157 (3.8)
 Physician 1452 (35.4)
 Other health care professionals 671 (16.3)
 Other 120 (2.9)
Breastfeeding at 3 months*
 No 957 (23.3)
 Yes 3150 (76.7)
Bed sharing at 3 months*
 Yes 1845 (46.8)
 No 2096 (53.2)
Usual infant sleep position*
 Prone 66 (1.6)
 Lateral 1768 (43.0)
 Supine (appropriate position) 2274 (55.4)
  1. *Variables collected at 3-month follow-up
  2. n = 4108