Table 1 Demographic information and neuropsychological data for subjects by group

Age (in whole years)

14.7 ± 0.49

14.8 ± 0.72

P = 0.439

Gender

7 girls/

18 girls/

P = 0.039^a

5 boys

10 boys

Cocaine exposure (weeks of maternal cocaine use divided by weeks of gestation)

None

0.402 ± 0.25

P <0.001^a

Tobacco exposure (average number of cigarettes per day)

0.020 ± 0.071

8.155 ± 7.79

P <0.001^a

Alcohol exposure (average ounces per day)

0.007 ± 0.015

0.199 ± 0.371

P = 0.011^a

Marijuana exposure (average number of joints per day)

0.003 ± 0.010

0.125 ± 0.367

P = 0.091^b

Postnatal cocaine exposure (hair sample positive for cocaine at age 10.5 years and/or 12.5 years)

6 yes / 6 no

10 yes / 18 no

P = 0.030^a

Total brain volume (in mm³)

1,582,350

1,559,794

P = 0.846

± 188,214

± 177,613

Word-color interference Stroop test, raw score

44.417 ± 9.54

39.857 ± 9.15

P = 0.605

Trail Making test, part A completion time (in seconds)

11.750 ± 4.37

12.786 ± 4.78

P = 0.882

Trail Making test, part B completion time (in seconds)

23.000 ± 7.86

29.643 ± 11.00

P = 0.360