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Table 1 Characteristics of teen mothers whose first pregnancy occurred during adolescence and after wave 1 at the add health study, 1996-2007 (N = 763)

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

  Overall sample (n = 763) Black (n = 244) Non-black (n = 519) P-value
Birthweight (kg) (mean[se]) 3.23(0.03) 3.10(0.05) 3.27(0.03) <0.01
Gestational age (week) (mean[se]) 39.29(0.11) 39.16(0.2) 39.33(0.12) 0.49
Baseline age (year) (mean[se]) 15.33(0.14) 15.36(0.26) 15.32(0.15) 0.89
Age at pregnancy (year) (mean[se]) 17.80(0.09) 17.67(0.13) 17.83(0.09) 0.20
Baseline BMI category (n [%])     0.03
Underweight 96(15.02) 25(10.88) 71(16.28)  
Normal weight 508(67.24) 155(63.43) 353(68.4)  
Over weight 119(13.07) 50(20.69) 69(10.74)  
Obese 40(4.68) 14(5.00) 26(4.58)  
Parental education ([n%])     0.41
≥HS 606(80.64) 213(83.44) 393(79.79)  
Less than HS 157(19.36) 31(16.56) 126(20.21)  
Educational aspiration(non-standardized) (mean[se])* −0.09(0.06) 0.06(0.09) −0.14(0.06) 0.05
GPA     0.04
Below average 312(42.99) 98(50.84) 214(40.59)  
Above average 451(57.01) 146(49.16) 305(59.41)  
Ever skipped a grade (n [%])     0.85
No 744(97.57) 239(97.78) 505(97.51)  
Yes 19(2.43) 5(2.22) 14(2.49)  
Ever repeated a grade (n [%])     0.20
No 618(79.82) 187(75.52) 431(81.14)  
Yes 145(20.18) 57(24.48) 88(18.86)  
Smoking during pregnancy (n [%])     <.0001
No 607(74.93) 230(93.81) 377(69.16)  
Yes 156(25.07) 14(6.19) 142(30.84)  
Initiation of prenatal care (n [%])     0.58
1st trimester 541(69.14) 174(71.63) 367(68.37)  
2nd trimester 154(21.77) 50(21.65) 104(21.81)  
3rd trimester or no prenatal care 68(9.09) 20(6.71) 48(9.82)  
  1. *Range of Educational aspiration score (non-standardized):−3.46, 1.23.