Table 2 Demographic and clinical characteristics of the children participants

From: Developmental changes in gamma-aminobutyric acid levels in attention-deficit/hyperactivity disorder

 

n

Mean (s.d.)

Median

Range

P

Age

 ADHD (m/f)

9/7

10.8 (1.1)

10.7

8.7–13.1

0.89a

 Control (m/f)

11/8

10.8 (1.9)

11

8.1–14.7

 

Conners Parents ADHD-Index

 ADHD

16

69.8 (3.1)

70

61.0–73.0

<0.001b

 Control

19

46.9 (12.6)

46

20.0–63.0

 

SDQ Parents Total

 ADHD

15

19.1 (6.5)

18

10.0–34.0

<0.001a

 Control

19

5.1 (3.1)

5

1.0–14.0

 

Medication

 ADHD

Methylphenidate (n=11)

 Control

None

    

Comorbidities

 ADHD

F40.2 specific (isolated) phobias (n=4); F82 specific developmental disorder of motor function (n=2); F81.0 specific reading disorder (n=1); F81.2 specific disorder of arithmetical skills (n=1)

 Control

None

    

Handedness

 ADHD (r/l)

12/4

    

 Control (r/l)

18/1

    
  1. Abbreviations: ADHD, attention-deficit/hyperactivity disorder; f, female; l, left-handed; m, male; n, total number of participants; r, right-handed; SDQ, strengths and difficulties questionnaire.
  2. aTwo-tailed two-sample t-test.
  3. bTwo-tailed Wilcoxon rank-sum test.