TABLE 5

Association Between Gestational Age and Neonatal Special Care in 2- to 3-y-Old Sample (N = 15 099)

% With Special CareUnadjusted RR (95% CI)Adjusted RR (95% CI)
Prenatal sociodemographic and lifestyle variables
 Maternal age
  <20 y10.31.21 (0.88 to 1.67)1.14 (0.83 to 1.58)
  20–34 y8.5ReferenceReference
  ≥35 y8.00.93 (0.76 to 1.14)0.88 (0.72 to 1.11)
 Smoking during pregnancy
  Yes10.21.25 (1.05 to 1.49)1.17 (0.98 to 1.40)
  No8.2ReferenceReference
 Alcohol during pregnancy
  Yes7.50.86 (0.68 to 1.09)0.96 (0.76 to 1.21)
  No8.7ReferenceReference
Biological determinants of preterm birth
 Placental ischemia and other hypoxia
  Yes14.31.86 (1.57 to 2.21)1.59 (1.34 to 1.88)
  No7.7ReferenceReference
 Other biological determinants
  Yes14.11.74 (1.37 to 2.20)1.48 (1.19 to 1.83)
  No8.1ReferenceReference
 Gestational age
  Late preterm26.94.03 (3.41 to 4.75)3.71 (3.15 to 4.38)
  Early term8.01.19 (1.01 to 1.41)1.16 (0.98 to 1.37)
  Full term6.7ReferenceReference
Other covariates
 Child gender
  Male9.71.35 (1.17 to 1.55)1.28 (1.12 to 1.47)
  Female7.2ReferenceReference
  • * Analyses also control for design variables (cycle of entry into the NLSCY, province, and urban/rural status).