Table 1: Demographic data.

NF1 ( )Unaffected ( )

Intellectual functioning (GCA)91.51 (SD = 13.41)105.75 (SD = 11.12)
Age (Mean, SD)4 years, 11 months (SD = 19.59 months)5 years, 3 months (SD = 19.28 months)
Gender
 Male3634
 Female2521
Ethnicity
 Caucasian4546
 African-American64
 Latino61
 Asian12
 Mixed ethnicity32
Maternal level of education
 High school115
 Higher education5050
Hollingshead SES index33.26 (SD = 16.05)36.29 (SD = 14.66)