Table 2 Examining the association of baseline demographic features and IQ scores of the children^a

Sex

Male

111.9 ± 13.7

 < 0.001^b*

Female

100.0 ± 17.1

Age, years

 < 7.5

110.4 ± 15.9

0.003^b*

 ≥ 7.5

102.6 ± 16.4

Mother’s education

Below high school diploma

103.1 ± 15.7

0.285^c

High school diploma

106.4 ± 16.4

Associate degree

107.5 ± 21.1

Bachelor’s degree

112.7 ± 18.5

Master’s degree

130.0 ± 0.0

Doctorate

105.0 ± 0.0

Father’s education

Below high school diploma

100.9 ± 15.7

0.974^c

High school diploma

108.0 ± 16.5

Associate degree

116.6 ± 17.1

Bachelor’s degree

108.7 ± 16.0

Master’s degree

113.0 ± 16.8

Doctorate

126.0 ± 0.0