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Table 1 Participant characteristics and descriptive statistics

From: Does IQ influence Associations between ADHD Symptoms and other Cognitive Functions in young Preschoolers?

Variable

Min

Max

 

M

SD

Gender (% boys/girls) (N = 1181)

  

52.3/47.7

  

Age in years (N = 1181)

3.1

3.9

 

3.5

0.1

Mothers’ edu. (in years) (N = 1132)

9

18

 

15.2

2.4

Fathers’ edu. (in years) (N = 1087)

9

18

 

14.5

2.6

Mothers’ age (N = 1180)

19

43

 

30.6

4.3

ADHD symptoms (N = 1181)

0

18

 

4.0

3.9

ODD symptoms (N = 1181)

0

8

 

1.4

1.5

IQ (N = 1181)

67

130

 

101.9

9.2

Verbal ability (N = 1181)

2

17

 

9.7

2.1

Nonverbal ability (N = 1181)

4

18

 

10.9

2.0

VWM (N = 1125)

2

16

 

10.8

2.9

NVWM (N = 1174)

2

17

 

10.4

2.8

Response inhibition (N = 1031)

0

30

 

14.7

8.4

Reported expr. language (N = 1067)

8

50

 

41.6

7.3

  1. Note. Edu. = education. Mothers’ age = age in years at the time of childbirth. Symptoms = number of symptoms. IQ = abbreviated IQ score estimated from the verbal ability and nonverbal ability subtasks from the Stanford-Binet-5 (SB-5). VWM = verbal working memory from SB-5. NVWM = nonverbal working memory from SB-5. The SB-5 subtask scores were standardized, with Mean = 10 and SD = 3. Response inhibition = statue task (NEPSY), raw scores. Reported expr. language = reported expressive language = CDI from preschool teachers, raw scores.