Table 2 Univariate analysis of possible confounding variables influencing birth weight, in premature infants (n = 189)
From: Smoking during pregnancy and harm reduction in birth weight: a cross-sectional study
Variable | β | SE | p | CI (β;95%) |
|---|---|---|---|---|
Age at delivery (years) | 5.5 | 18.0 | 0.762 | (−30.4 to 41.3) |
≤ 8 years of education | − 282.55 | 262.65 | 0.282 | (− 797.3 to 232.24) |
9 to 11 years of education | − 100.97 | 251.11 | 0.688 | (− 593.14 to 391.19) |
Employed | 124.2 | 203.2 | 0.543 | (−281.7 to 530.2) |
Live with a partner | 210.8 | 337.2 | 0.534 | (− 462.7 to 884.4) |
First pregnancy | 8.0 | 24.7 | 0.745 | (−41.2 to 57.3) |
Interval between deliveries (years) | 79.3 | 192.8 | 0.682 | (− 305.8 to 464.3) |
Pregestational obesity or overweight | −136.5 | 114.3 | 0.234 | (−361.9 to 89.0) |
Prenatal care in public service | 39.0 | 147.9 | 0.793 | (− 253.8 to 331.7) |
≥ 7 prenatal medical visitsb | 401.7 | 111.7 | 0.000 | (180.5 to 622.9) |
Alcohol consumption | − 210.7 | 279.1 | 0.452 | (− 763.2 to 341.7) |
Illegal drug use | 97.9 | 682.7 | 0.886 | (− 1253.5 to 1449.2) |
Participation in prenatal groupb | 203.1 | 118.6 | 0.089 | (−31.7 to 437.9) |
Advised regarding warning signs | −5.3 | 114.0 | 0.963 | (− 230.9 to 220.3) |
Use of folic acid and iron sulfate | −49.7 | 128.6 | 0.700 | (− 304.3 to 204.9) |
Emotional problemsb | 321.0 | 223.3 | 0.154 | (− 122.5 to 764.5) |
Anemia | − 465.7 | 449.7 | 0.303 | (− 1358.9 to 427.5) |
High blood pressure/pre-eclampsia/ eclampsia/ HELLP syndromea, b | − 469.5 | 303.7 | 0.126 | (− 1072.7 to 133.6) |
Diabetes | 314.7 | 328.7 | 0.341 | (− 338.2 to 967.6) |
Hyperemesisb | − 690.8 | 437.4 | 0.118 | (− 1559.5 to 177.9) |
Hemorrhage/ bleeding/threatened abortionb | − 442.1 | 321.8 | 0.173 | (− 1081.3 to 197.1) |
Infectionb | − 522.3 | 300.1 | 0.085 | (− 1118.3 to 73.8) |