From: Influence of maternal and social factors as predictors of low birth weight in Italy
Variable | OR | SE | 95% CI | p value |
---|---|---|---|---|
Outcome (low birth weight = 1, normal birth weight = 0) | ||||
Log-likelihood = -151.495, chi-square= 295.7, P value < 0.0001 | ||||
Gestational age (dichotomous: 0 = ≤ 36 weeks, 1 > 36 weeks) | 0.01 | 0.01 | 0.004–0.03 | < 0.0001 |
Number of fetuses (dichotomous: 0 = single, 1 = multiple) | 12.3 | 6.67 | 4.27–35.6 | < 0.0001 |
Maternal age | ||||
< 25 | 1.0* | |||
25–29 | 0.5 | 0.23 | 0.2–1.2 | 0.129 |
30–34 | 0.23 | 0.12 | 0.09–0.64 | 0.005 |
≥ 35 | 0.28 | 0.15 | 0.1–0.78 | 0.015 |
Number of prenatal care visits (dichotomous: 0 = 0–4 not satisfactory, 1 => 4 satisfactory) | 0.34 | 0.13 | 0.16–0.73 | 0.006 |
Type of delivery (dichotomous: 0 = eutocic, 1 = caesarean) | 2.34 | 0.74 | 1.26–4.34 | 0.007 |
Number of cigarettes/day during pregnancy (continuous) | 1.12 | 0.06 | 1.01–1.24 | 0.032 |
Course of pregnancy (dichotomous: 0 = physiologic, 1 = pathologic) | 2.22 | 1.13 | 0.81–6.04 | 0.12 |
Marital status of mother (dichotomous: 0 = other, 1 = married) | 2.04 | 1.18 | 0.66–6.34 | 0.216 |
Occupation of mother | ||||
Work outside home | 1.0* | |||
Unemployed | 1.75 | 0.88 | 0.65–4.67 | 0.266 |
Housewife | 1.26 | 0.48 | 0.6–2.64 | 0.534 |
Number of echographies (continuous) | 0.9 | 0.08 | 0.75–1.08 | 0.277 |
Amniocentesis (dichotomous: 0 = no, 1 = yes) | 0.7 | 0.36 | 0.25–1.93 | 0.489 |
Size of municipality of residence, inhabitants (dichotomous: 0 = ≤ 90.000 i.e. small town, 1 => 90.000, i.e. large town) | 1.19 | 0.38 | 0.64–2.24 | 0.583 |
Birth's order (dichotomous: 0 = 1–4, 1 => 4) | 0.55 | 1.18 | 0.01–37.28 | 0.78 |
Education level of mother (dichotomous: 0 = mother not a high school graduate, 1 = a high school graduate or more) | 0.95 | 0.31 | 0.5–1.81 | 0.882 |
Social support during pregnancy (dichotomous: 0 = no, 1 = yes) | 1.04 | 0.34 | 0.55–1.96 | 0.905 |
Newborn sex (dichotomous: 0 = female, 1 = male) | 1.03 | 0.32 | 0.56–1.9 | 0.932 |