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Table 1 Rates of preterm births by period before and after exclusions

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

Periods 1991-1995 1996-2000 2001-2008
Rates % % %
Preterm births before excluded values 4.70 4.90 5.90
(n) (1 354 711) (1 258 750) (1 861 983)
Preterm births after excludes values 4.42 4.71 5.65
(n) (1 323 021) (1 232 824) (1 836 582)
  1. Chile, Singletons Live Births, 1991-2008.