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Table 6 Crude and adjusted or for preterm births a by period

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

Period 1991-1995 1996-2000 2000-2008
ORb   OR CI 95% OR CI 95%
Crude OR Reference 1.07 [1.06, 1.08] 1.30 [1.28,1.31]
   OR CI 95% OR CI 95%
Ajusted OR Reference 1.06 [1.05, 1.07] 1.26 [1.25,1.28]
  1. Chile, Singletons live births, 1991–2008.
  2. aPreterm births : < 37 weeks of gestational age.
  3. bAll crude and adjusted OR ( adjusted for age, parity and marital status) with P < 0.001 for Wald’s chi-square.