Table 2: Summary of hierarchical linear regression analyses for body mass index (BMI). Significant effects are indicated in bold.

Predictor variablesValues at entry into the modelFinal model
ΔSig. Unstand. coeff. ()Stand. coeff. ()Sig.

Age 2.5
 (Constant)−2.190.10
 Sex0.000.000.230.230.63−0.01−0.010.96
 Birth weight0.050.052.534.810.030.000.230.03
 Fetal risk factors 0.070.022.241.630.20−0.39−0.330.01
 Maternal BMI0.130.063.326.190.010.050.300.03
 Smoking 0.130.012.760.580.450.060.090.41
 Breastfeeding dur.0.140.002.380.520.470.00−0.010.96
 Household SES0.140.002.080.410.52−0.01−0.080.45
 Mat. gen. depr.0.140.001.800.000.960.00−0.020.86
 Mat. life events0.150.001.650.500.48−0.04−0.080.50
 Exposure timing0.150.011.530.570.450.00−0.070.49
 Obj. hardship0.150.001.380.030.87−0.08−0.070.56
 Subj. distress0.170.011.381.370.250.130.140.25
Age 4
  (Constant)−3.240.04
 Sex0.000.000.060.060.810.010.010.96
 Birth weight0.030.030.951.840.180.000.160.16
 Fetal risk factors 0.090.062.104.300.04−0.10−0.070.56
 Maternal BMI0.300.216.7618.95<0.010.110.67<0.01
 Smoking 0.300.005.320.000.99−0.02−0.020.90
 Breastfeeding dur.0.310.014.500.600.440.030.190.14
 Household SES0.310.003.840.190.660.00−0.020.85
 Mat. gen. depr.0.310.003.310.030.860.000.030.83
 Mat. life events0.320.012.960.450.50−0.04−0.070.57
 Exposure timing0.360.043.173.740.060.00−0.170.13
 Obj. hardship0.390.023.132.150.15−0.29−0.220.07
 Subj. distress0.410.033.172.550.120.200.190.12
Difference
  (Constant)0.130.92
 Sex0.000.000.020.020.900.070.040.74
 Birth weight0.010.010.260.500.480.000.010.93
 Fetal risk factors 0.130.123.188.97<0.010.260.250.09
 Maternal BMI0.140.012.620.920.340.020.140.37
 Smoking 0.200.063.064.280.040.290.230.08
 Breastfeeding dur.0.200.002.560.250.620.010.100.49
 Household SES0.200.002.160.040.840.000.000.98
 Mat. gen. depr.0.210.011.970.660.42−0.01−0.120.37
 Mat. life events0.210.001.730.060.800.030.060.69
 Exposure timing0.270.062.094.420.040.00−0.270.03
 Objective hardship0.280.011.940.580.450.110.110.41
 Subjective distress0.280.001.760.170.68−0.05−0.060.68

Abbreviations: BMI: body mass index; Breastfeeding dur.: breastfeeding duration (months); SES: socioeconomic status; Mat.: maternal; Gen. depr.: general depression.