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. 2008 Oct 8;8:46. doi: 10.1186/1471-2393-8-46

Table 2.

Association between years of maternal education and preterm delivery among mothers 18 years of age and older, Santiago, Chile, 2004

Maternal Education (years) Preterm Delivery Preterm Low Birthweight Delivery
Crude Adjusted3 Crude Adjusted3

OR (95% CI) OR (95% CI) OR (95% CI) OR (95% CI)
< 12 yrs 1.12 (1.03, 1.23) 1.17 (1.06, 1.29) 1.14 (1.01, 1.29) 1.27 (1.11, 1.45)
= 12 yrs 1.05 (0.97, 1.14) 1.10 (1.01, 1.20) 1.12 (1.00, 1.26) 1.20 (1.06, 1.35)
> 12 yrs REFERENT REFERENT REFERENT REFERENT

homogenetity1 p = 0.04 p < 0.01 p = 0.06 p < 0.01
trend2 p = 0.01 p < 0.01 p = 0.03 p < 0.01

1 test of homogeneity (equal odds)

2 test for trend of odds

3 adjusted for parity, sex of child and maternal age using logistic regression