Table 1 Summary statistics of the included participants separated by the ADOS module used for assessment. The rows “Verbal IQ” and “Nonverbal IQ” show mean IQ values based only on deviation scores since ratio scores were not included in the analyses. The row “Highest certainty” shows the number and percentage of individuals who were diagnosed with Autistic Disorder with the highest possible certainty score. The rows “Father bachelor’s degree” and “Mother bachelor’s degree” show the numbers and percentages of individuals whose fathers and mothers, respectively, have obtained bachelor’s degrees

Total n = 1511

n = 394

n = 412

n = 705

Females

56 (14.2%)

68 (16.5%)

77 (10.9%)

Mean Age (SD)

8.0 (3.5)

7.5 (3.2)

9.9 (3.2)

Race

65% white, 8% Asian,

7% African American, 20% other

72% white, 5% Asian,

7% African American, 16% other

81% white, 3% Asian,

2% African American, 14% other

Ethnicity

16% Hispanic

15% Hispanic

11% Hispanic

Verbal IQ (SD)

57.9 (14.9) n = 102

76.6 (16.2) n = 301

89.4 (19.3) n = 690

Nonverbal IQ (SD)

70.9 (17.2) n = 152

83.9 (17.1) n = 347

93.1 (18.0) n = 695

Highest Certainty

329 (83.5%)

302 (73.3%)

401 (56.9%)

Father Bachelor’s Degree

221 (56.1%)

255 (61.9%)

407 (57.7%)

Mother Bachelor’s Degree

216 (54.8%)

249 (60.4%)

425 (60.3%)