Journal of Pregnancy / 2012 / Article / Tab 3

Research Article

Effects of Tobacco Smoking in Pregnancy on Offspring Intelligence at the Age of 5

Table 3

Maternal smoking in pregnancy and the risk of low IQ.

Average number of cigarettes/dayCrudeAdjusted for core confoundersaAdjusted for potential confoundersb
OR (95% CI)OR (95% CI)OR (95% CI)

Full-scale IQ
 01.001.001.00
 1–91.60 (0.94, 2.70)1.39 (0.78, 2.48)1.52 (0.78, 2.99)
 10+1.31 (0.74, 2.31)1.02 (0.56, 1.85)1.06 (0.55, 2.19)
Verbal IQ
 01.001.001.00
 1–91.78 (1.03, 3.09)1.49 (0.81, 2.73)1.65 (0.85, 3.22)
 10+1.19 (0.64, 2.19)0.90 (0.48, 1.69)0.94 (0.50, 1.75)
Performance IQ
 01.001.001.00
 1–91.19 (0.69, 2.05)1.08 (0.59, 1.95)1.04 (0.54, 2.03)
 10+1.65 (0.97, 2.79)1.41 (0.81, 2.48)1.31 (0.65, 2.62)

aParental education, maternal IQ, prenatal maternal alcohol consumption, the child’s sex, age at testing, and tester.
bParental education, maternal IQ, prenatal maternal alcohol consumption, the child’s sex, age at testing, and tester, maternal age, parity, maternal marital status, prenatal paternal smoking, postnatal parental smoking, breast feeding, maternal prepregnancy BMI, the child’s sex, age at testing, health status, family/home environment.