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 |