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Table 2 Adjusted* relative risks (for categorical variables) and beta coefficients (for numerical variables) of different outcomes according to gestational age (reference group= 39–41 weeks)

From: Gestational age at birth and morbidity, mortality, and growth in the first 4 years of life: findings from three birth cohorts in Southern Brazil

Outcome Gestational age in completed weeks
  <34 (n=348) 34-36 (n=1202) 37 (n=1680) 38 (n=3089) 39-41 (n=7055) 42+ (n=745)
Neonatal mortality (n=13031) 34.4 (21.6; 54.8) 3.4 (1.8; 6.6) 2.7 (1.3; 5.6) 2.0 (1.1; 3.5) 1.0 2.1 (1.0; 4.3)
Infant mortality (n=13031) 13.6 (9.7; 19.2) 3.1 (2.1; 4.7) 2.2 (1.4; 3.6) 1.4 (0.9; 2.2) 1.0 1.4 (0.9; 2.4)
Hospitalization 0–12 mo (n=5625) 2.4 (1.9; 3.1) 1.8 (1.4; 2.1) 1.2 (1.0; 1.6) 1.2 (1.0; 1.5) 1.0 0.9 (0.7; 1.2)
Breastfeeding (months) (n=5620) −3.5 (−4.4; -2.4) −0.8 (−1.5; -0.2) −0.4 (−1.0; 0.3) −0.4 (−0.9; 0.1) 0 −0.4 (−1.2; 0.3)
WAZ < −2 at 12 mo (%) (n=5615) 3.2 (1.7; 6.1) 2.6 (1.5; 4.5) 2.0 (1.1; 3.7) 1.4 (0.8; 2.5) 1.0 1.6 (0.8; 2.5)
HAZ < −2 at 12 mo (%) (n=5604) 2.0 (1.3; 2.9) 1.7 (1.2; 2.3) 1.3 (0.9; 1.9) 1.2 (0.9; 1.6) 1.0 1.0 (0.6; 1.5)
WHZ > 2 at 12 mo (%) (n=5604) 0.5 (0.2; 1.0) 0.7 (0.5; 1.0) 1.2 (0.9; 1.6) 1.0 (0.7; 1.2) 1.0 0.9 (0.6; 1.2)
WAZ < −2 at 48 mo (%) (n=7983) 1.4 (0.6; 3.1) 1.4 (0.8; 2.5) 0.9 (0.5; 1.7) 1.0 (0.6; 1.6) 1.0 0.8 (0.4; 1.5)
HAZ < −2 at 48 mo (%) (n=7946) 0.9 (0.5; 1.5) 1.0 (0.7; 1.4) 0.9 (0.6; 1.2) 0.8 (0.6; 1.1) 1.0 0.9 (0.6; 1.2)
WHZ > 2 at 48 mo (%) (n=7946) 1.1 (0.6; 1.8) 0.8 (0.6; 1.1) 1.0 (0.7; 1.2) 1.0 (0.8; 1.2) 1.0 1.0 (0.8; 1.3)
  1. Pelotas (Brazil) Birth Cohorts 1982, 1993, 2004.
  2. Abbreviation: WAZ: weight for age z-score; HAZ: height for age z-score; WHZ: weight for height z-score.
  3. * Adjusted for family income, parity, smoking, marital status, height, maternal education, and maternal age.