Table 4 Bivariate and multivariable logistic regression analysis of factors predicting preterm birth

Maternal age [years]

15 to 24

1.00

1.00

25 to 34

1.23(0.78–1.93)

1.27(0.79–2.03)

35 to 49

2.14(1.25–3.65)

2.00(1.13–3.53)

Partner’s smoking status

Yes

2.01(1.12–3.60)

1.91(1.04–3.51)

No

1.00

1.00

ANC visits

< 4

1.63(1.08–2.46)

1.51(0.98–2.34)

>=4

1.00

1.00

History of abortion

Yes

1.80(1.10–2.95)

1.89(1.13–3.15)

No

1.00

1.00

Preterm rupture of membrane

Yes

11.29(4.02–31.73)

9.30(3.18–27.16)

No

1.00

1.00

Hospitalization during pregnancy

Yes

3.75(1.54–9.17)

2.23(0.75–6.60)

No

1.00

1.00

Hypertension in Pregnancy

Yes

5.39(1.62–17.95)

4.40(1.18–16.42)

No

1.00

1.00

Vaginal infection

Yes

1.86(1.06–3.28)

1.39(0.75–2.57)

No

1.00

1.00