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Table 2 Characteristics of the study population at baseline

From: Psychometric validation of the Weiss Functional Impairment Rating Scale-Parent Report Form in children and adolescents with attention-deficit/hyperactivity disorder

Characteristic Sample 1a Sample 2b
n 1185 1172
Demographics   
Age, years, mean (SD) 11.0 (2.9) 11.1 (2.9)
 Age 6–12 years, n (%) 793 (67) 782 (67)
 Age 13–17 years, n (%) 392 (33) 390 (33)
Gender, n (%)   
 Female 292 (25) 316 (27)
 Male 893 (75) 856 (73)
Clinical measures, mean (SD)   
ADHD-RS-IV   
 Total scale 42.0 (6.5) 42.0 (6.5)
 Inattention 19.3 (5.3) 19.3 (5.3)
 Hyperactivity Impulsivity 22.7 (3.2) 22.6 (3.4)
CGI–S 4.9 (0.8) 4.9 (0.8)
WFIRS-P, mean (SD)   
Family domain 1.24 (0.78) 1.24 (0.76)
Learning and School domain 1.31 (0.65) 1.28 (0.64)
Life Skills domain 1.14 (0.53) 1.11 (0.51)
Child’s Self-Concept domain 0.91 (0.79) 0.90 (0.78)
Social Activities domain 0.96 (0.73) 0.95 (0.71)
Risky Activities domain 0.48 (0.40) 0.46 (0.38)
WFIRS-P summary index 1.03 (0.47) 1.01 (0.45)
  1. aSample 1 refers to the first random split half-sample from the pooled clinical trial data. bSample 2 is the second random split half-sample
  2. ADHD-RS-IVADHD Rating Scale Version IV, CGI–S Clinical Global Impression–Severity, SD standard deviation, WFIRS-P Weiss Functional Impairment Rating Scale-Parent Report Form