Table 4 Multivariable analysis between maternal characteristics, educational variables and birthweight (kg) (N = 763) ^†

Baseline age

−0.03(0.03)

−0.03(0.03)

0.004(0.02)

0.002(0.02)

Age at pregnancy

−0.004(0.03)

−0.001(0.03)

−0.03(0.03)

−0.02(0.03)

Baseline BMI category

Underweight

0.17(0.16)

0.14(0.16)

−0.15(0.07)

−0.15(0.07)

Normal weight

ref

ref

ref

ref

Over weight

0.15(0.13)

0.15(0.13)

−0.11(0.13)

−0.12(0.13)

Obese

−0.17(0.35)

−0.21(0.37)

0.06(0.11)

0.05(0.11)

Parental education

≥HS

ref

ref

ref

ref

Less than HS

0.13(0.08)^§

0.15(0.08)^§

−0.07(0.09)^§

−0.07(0.10)^§

GPA

Below average

−0.002(0.14)

−0.01(0.14)

0.11(0.07)

0.12(0.07)

Above average

ref

ref

ref

ref

Ever skipped a grade

No

ref

ref

ref

ref

Yes

0.20(0.10)^*

0.22(0.09)^*

0.50(0.17)^**

0.49(0.17)^**

Ever repeated a grade

No

ref

ref

ref

ref

Yes

−0.09(0.07)

−0.11(0.08)

−0.08(0.08)

−0.08(0.08)

Educational aspiration

−0.05(0.05)^§

−0.05(0.05)^§

0.08(0.04)^*§

0.08(0.04)^*§

Smoking during pregnancy

No

ref

ref

Yes

0.31(0.13)^*§

−0.03(0.07)^§

Initiation of prenatal care

1^st trimester

ref

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2^nd trimester

0.001(0.09)

0.07(0.06)

3^rd trimester or no prenatal care

−0.06(0.08)

−0.01(0.13)