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Table 1 Frequency of different outcomes during the first four years of life according to gestational age

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 Cohort Number in the analyses Gestational age in completed weeks All P value
    <34 34-36 37 38 39-41 42+   
Neonatal mortality/1,000 All 13273 168 19 11 8 4 9 12 <0.001
Infant mortality/1,000 All 13273 189 40 23 14 10 17 21 <0.001
Total breastfeeding (months) (mean) All 9453 6.1 7.5 8.4 8.3 8.1 7.7 8.0 0.004
Hospitalization 0–12 mo (%) All 6071 38.1 26.1 18.0 16.6 14.3 15.2 17.1 <0.001
WAZ < −2 at 12 mo (%) All 6059 6.8 4.5 2.7 2.0 1.5 2.8 2.3 <0.001
HAZ < −2 at 12 mo (%) All 6048 14.5 10.3 6.6 6.1 5.6 6.3 6.6 <0.001
WHZ > 2 at 12 mo (%) All 6048 4.7 6.4 10.4 8.5 8.4 7.8 8.2 0.06
WAZ < −2 at 48 mo (%) All 8442 3.3 2.7 1.6 1.7 1.8 1.7 1.9 0.27
HAZ < −2 at 48 mo (%) All 8442 7.9 6.8 5.4 5.4 6.5 7.5 6.4 0.29
WHZ > 2 at 48 mo (%) All 8442 9.2 7.9 10.1 10.8 9.6 9.2 9.7 0.45
Number of births in the 3 cohorts All   869 1497 1434 2431 8287 1259 15777  
  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.