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Table 2 ADHD subtypes, symptom frequencies and age of symptom onset

From: The impact of study design and diagnostic approach in a large multi-centre ADHD study. Part 1: ADHD symptom patterns

   

Number of symptoms *

Age at first symptom detection°

Boys

                  
   

Inattention

Hyperactivity/Impulsivity

Inattention

Hyperactivity/Impulsivity

Status

ADHD subtype

N

Mean t

CI low

CI up

Range

Mean t

CI low

CI up

Range

Mean t

CI low

CI up

Range

Mean t

CI low

CI up

Range

Siblings

No Diagnosis

39

6.28

5.24

7.24

0 - 9

4.60

3.32

5.92

1 - 9

6.20

5.00

7.75

1 - 15

3.50

2.13

5.19

1 - 13

 

Hyperactive/Impuslive

15

4.33

3.56

5.00

1 - 5

7.89

6.89

8.56

6 - 9

4.75

3.63

5.75

1 - 9

2.89

2.11

3.78

1 - 6

 

Inattentive

43

7.59

7.11

8.07

6 - 9

3.96

3.41

4.41

1 - 5

4.38

3.85

4.96

1 - 6

3.67

2.90

4.43

0 - 10

 

Combined

118

8.47

8.21

8.69

6 - 9

8.40

8.17

8.56

6 - 9

4.06

3.63

4.44

1 - 10

2.94

2.49

3.39

1 - 7

 

All subtypes

215

7.88

7.60

8.13

0 - 9

7.22

6.74

7.60

1 - 9

4.42

4.14

4.70

1 - 15

3.11

2.74

3.46

0 - 13

Probands

Combined

938

8.50

8.42

8.58

6 - 9

8.47

8.39

8.55

6 - 9

4.23

4.10

4.35

0 - 12

2.41

2.27

2.55

0 - 11

Girls

                  
   

Inattention

Hyperactivity/Impulsivity

Inattention

Hyperactivity/Impulsivity

Status

ADHD subtype

N

Mean t

CI low

CI up

Range

Mean t

CI low

CI up

Range

Mean t

CI low

CI up

Range

Mean t

CI low

CI up

Range

Siblings

No Diagnosis

40

4.21

3.33

5.17

0 - 9

3.04

2.21

3.83

0 - 9

6.32

5.32

7.63

1 - 16

4.71

2.86

7.29

1 - 15

 

Hyperactive/Impuslive

11

4.00

2.57

4.71

1 - 5

6.86

6.29

7.57

6 - 9

3.60

2.40

6.80

1 - 11

3.57

2.14

5.00

1 - 6

 

Inattentive

33

7.38

6.95

7.86

6 - 9

3.24

2.43

3.90

1 - 5

5.26

4.74

5.74

1 - 6

3.40

2.20

4.60

1 - 6

 

Combined

40

8.33

7.92

8.71

6 - 9

8.38

7.96

8.71

6 - 9

4.13

3.29

4.83

0 - 8

2.42

1.75

3.29

0 - 6

 

All subtypes

124

6.76

6.22

7.30

0 - 9

5.20

4.50

5.88

0 - 9

4.91

4.49

5.31

0 - 16

3.16

2.53

3.81

0 - 15

Probands

Combined

130

8.27

8.04

8.49

6 - 9

8.38

8.13

8.62

6 - 9

4.10

3.75

4.43

0 - 12

1.97

1.64

2.35

0 - 11

All

                  
   

Inattention

Hyperactivity/Impulsivity

Inattention

Hyperactivity/Impulsivity

Status

ADHD subtype

N

Mean t

CI low

CI up

Range

Mean t

CI low

CI up

Range

Mean t

CI low

CI up

Range

Mean t

CI low

CI up

Range

Siblings

No Diagnosis

79

5.27

4.49

5.98

0 - 9

3.63

2.96

4.35

0 - 9

6.19

5.35

7.24

1 - 16

3.93

2.87

5.43

1 - 15

 

Hyperactive/Impuslive

26

4.19

3.50

4.69

1 - 5

7.38

6.81

8.06

6 - 9

4.31

3.38

5.46

1 - 11

3.13

2.38

3.94

1 - 6

 

Inattentive

76

7.50

7.13

7.89

6 - 9

3.67

3.17

4.11

1 - 5

4.80

4.36

5.20

1 - 6

3.56

2.85

4.24

0 - 10

 

Combined

158

8.44

8.23

8.66

6 - 9

8.40

8.19

8.55

6 - 9

4.07

3.73

4.44

0 - 10

2.81

2.41

3.22

0 - 7

 

All subtypes

339

7.56

7.27

7.79

0 - 9

6.53

6.10

6.92

0 - 9

4.59

4.36

4.82

0 - 16

3.09

2.78

3.41

0 - 15

Probands

Combined

1068

8.48

8.39

8.55

6 - 9

8.46

8.38

8.54

6 - 9

4.22

4.10

4.33

0 - 12

2.36

2.23

2.48

0 - 11

  1. * Frequencies are based on the combination of the parental Interview (PACS) and the teacher questionnaire (CTRS)
  2. ° As reported by the PACS
  3. Mean t 20% trimmed mean
  4. CI low 95% confidence interval for trimmed mean (lower end)
  5. CI up 95% confidence interval for trimmed mean (upper end)