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Table 1 Distribution of births according to the characteristics of the newborns, 1997/98 and 2010 São Luís birth cohorts

From: Low birth weight in São Luís, northeastern Brazil: trends and associated factors

Variables São Luís 1997/98 São Luís 2010 p*
n=2.426 n=5.040
n % n %
Newborn’s sex      0.002
 Male 1331 54.9 2569 51.0  
 Female 1095 45.1 2471 49.0  
Birth weight      0.847
 500-2,499 185 7.6 378 7.5  
 ≥2,500 2241 92.4 4662 92.5  
Preterm birth      0.424
 Yes 301 12.4 593 11.8  
 No 2125 87.6 4447 88.2  
IUGR **      0.394
 No 2003 82.6 4183 83.0  
 Mild 178 7.3 401 7.9  
 Moderate 109 4.5 211 4.2  
 Severe 136 5.6 245 4.9  
  1. *p value calculated by the Pearson chi-square test.
  2. **IUGR – intrauterine growth restriction based on the birth weight ratio.