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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 valueCohen’s d
Mean (SD)Mean (SD)
Age (years)11.22 (3.43)10.08 (2.74)< 0.001**0.37
IQa87.49 (24.63)97.50 (15.91)< 0.001**0.48
ABAS composite scoresb
 Conceptual71.07 (15.36)81.38 (14.04)< 0.001 **0.70
 Social70.96 (12.43)85.68 (16.52)< 0.001 **1.00
 Practical64.23 (18.35)79.49 (17.19)< 0.001 **0.86
 SCQ score19.96 (7.86)7.76 (5.94)< 0.001 **1.75
SWAN INA score4.72 (2.94)5.40 (2.88)< 0.01 **0.23
SWAN IMP/HYP score3.68 (2.96)3.49 (3.10)0.430.06
 n (%)n (%)p value 
Males242 (79.87%)253 (79.31%)0.92 
Clinical co-occurring ASDc-4 (1.36%)- 
Clinical co-occurring ADHDd55 (18.97%)-- 
ASD caseness221 (72.94%)43 (13.48%)< 0.001** 
ADHD caseness161 (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