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Table 2 Sample Characteristics by ASD Affected or Unaffected status (N = 770)

From: Prevalence of non-febrile seizures in children with idiopathic autism spectrum disorder and their unaffected siblings: a retrospective cohort study

Characteristic variable ASD (n = 610) # (%) Unaffected siblings (n = 160) # (%) F or χ2; p
Gender
 Male 477 (78.1) 73 (44.2) χ2(1) = 61.08; <0.0001
 Female 134 (21.9) 92 (55.8)
 Mean age (yr.) at AGRE medical assessment 8.34 (SE 0.16) 9.01 (SE 0.35) F(1) = 1.35; 0.25
aRace
 White 487 (79.7) 135 (81.8) χ2(2) = 1.11; 0.57
 Asian 26 (4.3) 8 (4.9)
 Other race, multiple race, or unknown 98 (16.0) 22 (13.3)
aEthnicity
 Hispanic or Latino 115 (18.8) 34 (20.6) χ2(2) = 0.40; 0.82
 Not Hispanic or Latino 474 (77.6) 126 (76.4)
 Unknown 22 (3.6) 5 (3.0)
Maternal education
  ≤ High school 53 (9.2) 13 (8.1) χ2(2) = 1.03; 0.60
 Some college or graduated from college 392 (68.8) 115 (71.9)
 Some grad school or completed grad school 133 (18.0) 32 (20.0)
Paternal education
  ≤ High school 75 (13.2) 27 (16.9) χ2(2) = 1.81; 0.40
 Some college or graduated from college 332 (58.3) 93 (58.1)
 Some grad school or completed grad school 162 (28.5) 40 (25.0)
  1. aRace and Ethnicity categories were collapsed to avoid empty cells. Race categories “American Indian/Alaskan Native” n = 2, “Asian” n = 26, “Black or African American” n = 8, “More than One Race” n = 46, “Native Hawaiian or other Pacific Islander” n = 6, “Unknown” n = 36 were combined under “Other race, multiple race, or unknown”. For our Ethnicity variable, the category “Unknown” n = 22 was set to missing