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) |