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Table 4 Rates of preterm births by mothers’ socio demographic characteristics

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

Periods   1991-1995 1996-2000 2001-2008 aP1-P2 P2-P3 P1-P3 Overall trend
Mothers’ characteristics Rates (%) of Preterm birthsb P c P P P
Age <18 5.85 5.83 6.75 0.84 <0.001 <0.001 0.002
18-38 4.22 4.49 5.41 <0.001 <0.001 <0.001 <0.001
>38 7.19 7.65 8.35 <0.001 <0.001 <0.001 0.001
Marital Status Living with partner 4.13 4.62 5.60 <0.001 <0.001 <0.001 <0.001
Not living with partner 4.89 4.87 5.73 0.66 <0.001 <0.001 0.007
Parity Primipara 4.62 4.95 5.93 <0.001 <0.001 <0.001 <0.001
Multipara 4.17 4.47 5.41 <0.001 <0.001 <0.001 <0.001
Grand multipara 5.76 5.76 6.92 0.99 <0.001 <0.001 0.001
  1. Chile, Singletons Live Births, 1991–2008.
  2. aPeriods : P1 : 1991–1995, P2 : 1996–2000, P3 :2001–2008.
  3. bPreterm births: < 37 weeks of gestational age.
  4. c Pearson’s chi-square test.