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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.