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Table 5 Results of the logistic regression model comparing very low birth weight vs low birth weight newborns

From: Influence of maternal and social factors as predictors of low birth weight in Italy

Variable

OR

SE

95% CI

p value

Outcome (very low birth weight = 1, low birth weight = 0)

    

Log-likelihood = -31.645, chi-square= 80.01, P value<0.0001

    

Gestational age (dichotomous: 0 = ≤ 36 weeks, 1>36 weeks)

0.005

0.01

0.001–0.16

0.003

Number of echographies (continuous)

0.51

0.13

0.31–0.83

0.007

Education level of mother (dichotomous: 0 = mother not a high school graduate, 1 = a high school graduate or more)

0.12

0.1

0.02–0.61

0.011

Size of municipality of residence, inhabitants (dichotomous: 0 = ≤ 90.000 i.e. small town, 1=>90.000, i.e. large town)

0.1

0.1

0.01–0.66

0.017

Course of pregnancy (dichotomous: 0 = physiologic, 1 = pathologic)

6.08

4.84

1.28–28.97

0.023

Occupation of mother

    

Work outside home

1.0*

   

Unemployed

0.01

0.03

0.001–0.65

0.029

Housewife

0.2

0.24

0.02–2.14

0.182

Marital status of mother (dichotomous: 0 = other, 1 = married)

12.21

24.73

0.23–637.31

0.215

Maternal age

    

<25

1.0*

   

25–29

3.98

5.1

0.32–49.02

0.282

30–34

0.49

0.61

0.04–5.66

0.568

≥ 35

1.22

1.57

0.1–15.12

0.875

Number of fetuses (dichotomous: 0 = single, 1 = multiple)

2.52

2.38

0.4–15.99

0.325

Newborn sex (dichotomous: 0 = female, 1 = male)

0.6

0.5

0.12–3.08

0.542

Number of cigarettes/day during pregnancy (continuous)

0.8

0.31

0.37–1.71

0.564

Number of prenatal care visits (dichotomous: 0 = 0–4 not satisfactory, 1=> 4 satisfactory)

1.48

1.19

0.31–7.17

0.624

Social support during pregnancy (dichotomous: 0 = no, 1 = yes)

1.24

0.92

0.29–5.34

0.775

Amniocentesis (dichotomous: 0 = no, 1 = yes)

0.78

0.85

0.09–6.56

0.818

Type of delivery (dichotomous: 0 = eutocic, 1 = caesarean)

0.99

0.87

0.18–5.58

0.989

  1. *Reference category