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Table 2 Rates of preterm births by period in Chile

From: Sociodemographic characteristics of mother’s population and risk of preterm birth in Chile

Periods 1991-1995 1996-2000 2001-2008  
N = 4 392 427  
  Rate % 95% CIa (n) Rate % 95% CI (n) Rate % 95% CI (n) P b
Preterm Birthsc 4.42 [4.38,4.45] 1 323 021 4.71 [4.67,4.75] 1 232 824 5.65 [5.62,5.69] 1 836 582 < 0.001
  1. Singletons Live Births, 1991–2008.
  2. a 95% Confidence interval.
  3. bPearson’s chi-square test between periods.
  4. cPreterm births in weeks of gestational age (WGA).