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

From: Academic performance, educational aspiration and birth outcomes among adolescent mothers: a national longitudinal study

  Black (n = 244) Non-black (n = 519) P-value for interaction
  Β(se) P Β(se) P
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
1st trimester ref   ref   
2nd trimester 0.03(0.10)   0.05(0.07)   
3rd trimester or no prenatal care −0.11(0.09)   −0.001(0.12)   
  1. *Figures presented are regression coefficients with standard errors.