Table 2 Bivariate analysis between maternal characteristics, education variables and birthweight (kg) (N = 763)*

Baseline age

−0.03(0.03)

0.41

0.004(0.02)

0.84

0.42

Age at pregnancy

−0.01(0.03)

0.82

−0.02(0.03)

0.59

0.84

Baseline BMI category

0.44

0.15

0.08

Underweight

0.13(0.16)

−0.16(0.07)

Normal weight

ref

ref

Over weight

0.17(0.12)

−0.10(0.14)

Obese

−0.15(0.34)

0.04(0.10)

Parental education

0.06

0.51

0.11

≥HS

ref

ref

Less than HS

0.16(0.08)

−0.07(0.10)

Educational aspiration standardized

−0.04(0.06)

0.46

0.07(0.03)

0.03

0.10

GPA

0.86

0.63

0.95

Below average

0.02(0.14)

0.03(0.07)

Above average

ref

ref

Ever skipped a grade

0.35

<0.01

0.09

No

ref

ref

Yes

0.12(0.13)

0.48(0.15)

Ever repeated a grade

0.44

0.21

0.63

No

ref

ref

Yes

−0.05(0.07)

−0.11(0.08)

Smoking during pregnancy

0.05

0.36

0.03

No

ref

ref

Yes

0.24(0.12)

−0.06(0.07)

Initiation of prenatal care

0.47

0.71

0.71

1^st trimester

ref

ref

2^nd trimester

0.03(0.10)

0.05(0.07)

3^rd trimester or no prenatal care

−0.11(0.09)

−0.001(0.12)