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Table 1 Descriptive data of study sample

From: Inattention and hyperactive/impulsive component scores do not differentiate between autism spectrum disorder and attention-deficit/hyperactivity disorder in a clinical sample

  ASD (n = 303) ADHD (n = 319) p value Cohen’s d
Mean (SD) Mean (SD)
Age (years) 11.22 (3.43) 10.08 (2.74) < 0.001** 0.37
IQa 87.49 (24.63) 97.50 (15.91) < 0.001** 0.48
ABAS composite scoresb
 Conceptual 71.07 (15.36) 81.38 (14.04) < 0.001 ** 0.70
 Social 70.96 (12.43) 85.68 (16.52) < 0.001 ** 1.00
 Practical 64.23 (18.35) 79.49 (17.19) < 0.001 ** 0.86
 SCQ score 19.96 (7.86) 7.76 (5.94) < 0.001 ** 1.75
SWAN INA score 4.72 (2.94) 5.40 (2.88) < 0.01 ** 0.23
SWAN IMP/HYP score 3.68 (2.96) 3.49 (3.10) 0.43 0.06
  n (%) n (%) p value  
Males 242 (79.87%) 253 (79.31%) 0.92  
Clinical co-occurring ASDc - 4 (1.36%) -  
Clinical co-occurring ADHDd 55 (18.97%) - -  
ASD caseness 221 (72.94%) 43 (13.48%) < 0.001**  
ADHD caseness 161 (53.14%) 200 (62.70%) 0.02*  
  1. ADHD attention-deficit/hyperactivity disorder, ASD autism spectrum disorder, ABAS adaptive behavior assessment system, SCQ social communication questionnaire, SWAN strengths and weaknesses of ADHD symptoms and normal behavior questionnaire, INA inattention, HYP/IMP hyperactivity/impulsivity
  2. a30 ASD participants were missing IQ information and 193 ADHD participants were missing IQ information
  3. b24 ASD participants were missing ABAS information and 131 ADHD participants were missing ABAS information
  4. c13 ASD participants were missing co-occurring mental health condition information
  5. d25 ADHD participants were missing co-occurring mental health condition information
  6. *p < 0.05
  7. **p < 0.01