TABLE 4

Results From Sibling Comparison Analyses of the Association Between Maternal Smoking During Pregnancy and Child ADHD Symptoms, With and Without Imputed Missing Values on the ADHD Measure

baSEaPabbSEbPb
Total sample0.090.01<.0010.110.01<.001
Within-effects: discordant siblings−0.010.03.58−0.020.04.65
Between- effects: maternal effects0.110.03<.0010.130.04<.001
  • a Missing values were imputed on the ADHD measure, and 530 sibling pairs discordant for maternal smoking were available for analysis.

  • b Missing values were not imputed on the ADHD measure, yielding 72 sibling pairs discordant for maternal smoking available for analysis. All analyses were controlled for parity, maternal age, and child’s birth year.