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Table 1 Sample characteristics

From: Relationship between endophenotype and phenotype in ADHD

 

first-borns (N= 331)

second-borns (N= 323)

 

affected

non-affected

control

  

affected

non-affected

control

  
 

N = 143 (43%)

N = 68 (21%)

N = 120 (36%)

  

N = 132 (41%)

N = 78 (24%)

N = 113 (35%)

  
 

M

SD

M

SD

M

SD

F 2,328

contrasts1

M

SD

M

SD

M

SD

F 2,320

contrasts1

age in years

13.2

2.6

14.9

2.7

13.3

2.7

10.9

2 > 1 = 3

11.6

2.7

9.7

2.4

10.6

2.9

11.3

1 > 2 = 3

% male

76.9

 

45.6

 

44.2

 

34.82

1 > 2 = 3

75.8

 

48.7

 

38.1

 

37.42

1 > 2 = 3

estimated full scale IQ

99.8

11.8

101.8

10.7

106.2

9.9

11.3

1 = 2 < 3

99.2

11.8

105.5

10.9

105.6

10.1

13.2

1 < 2 = 3

Conners' parent DSM-IV

                

   inattentive

68.6

10.0

48.6

7.2

46.3

4.5

306.6

1 > 2 = 3

69.7

10.4

46.8

6.5

46.7

4.9

329.9

1 > 2 = 3

   hyperactive-impulsive

75.4

12.9

48.4

6.9

47.3

4.9

343.1

1 > 2 = 3

76.0

11.3

49.6

6.8

47.6

5.2

410.0

1 > 2 = 3

Conners' teacher DSM-IV

                

   inattentive

64.1

9.5

48.8

6.4

46.2

4.7

211.4

1 > 2 = 3

65.7

9.3

48.0

5.6

46.3

4.2

279.0

1 > 2 = 3

   hyperactive-impulsive

68.2

11.7

48.5

7.7

46.3

3.9

236.2

1 > 2 = 3

69.0

11.5

47.7

4.7

47.2

5.5

260.5

1 > 2 = 3

  1. Note. 1 = affected; 2 = non-affected; 3 = controls. 1 = contrasts based on p-values of ≤ .05. 2 = χ2.
  2. ADHD = Attention-Deficit/Hyperactivity Disorder; DSM-IV = Diagnostic and Statistical Manual for Mental Disorders (4th edition).
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Behavioral and Brain Functions

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