Table 3

Factors associated with VLBW infant delivery after adjustment for potential confounding and assessment for effect modification

main effect variables and interaction terms in the resulting model*

OR (95% CI)


previous preterm delivery

2.31 (1.20–4.44)

low maternal education

2.00 (1.31–3.19)

single-room apartment

1.95 (0.98–3.87)

previous fetal loss

1.64 (1.09–2.46)

maternal unemployment

1.60 (0.94–2.72)

smoking during pregnancy

1.51 (0.99–2.31)

no single mother, living in East Berlin**

1.0

no single mother, living in West Berlin

0.96 (0.61–1.51)

single mother, living in East Berlin

1.53 (0.78–3.00)

single mother, living in West Berlin

3.86 (1.50–9.95)


* Obtained after backward multiple logistic regression ** reference category

Grimmer et al. BMC Public Health 2002 2:10   doi:10.1186/1471-2458-2-10

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