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. Author manuscript; available in PMC: 2013 Nov 1.
Published in final edited form as: J Abnorm Child Psychol. 2012 Nov;40(8):1301–1312. doi: 10.1007/s10802-012-9641-8

Table 1.

Descriptive statistics for ADHD Symptoms (Counts)

Assessment
3 Year 4 Year 5 year

Symptom Description % % %
1. Makes careless mistakes. 17.1 12.5 10.0
2. Fidgets, squirms in seat. 34.2 26.3 20.8
3. Difficulty sustaining attention 23.1 16.6 15.2
4. Leaves seat 28.3 21.9 16.1
5. Does not seem to listen 23.2 15.2 12.3
6. Runs about or climbs excessively 21.4 17.4 12.5
7. Does not follow through on instructions 16.9 10.9 8.9
8. Difficulty playing quietly 14.9 14.3 10.3
9. Difficulty organizing tasks 13.2 12.1 8.4
10. Acts as if “driven by a motor” 37.8 39.5 31.6
11. Avoids tasks of sustained mental effort 12.7 10.9 9.0
12. Talks excessively 41.2 46.3 42.0
13. Loses things 17.1 15.4 13.0
14. Blurts out answers 13.8 14.9 16.2
15. Easily distracted 30.3 28.8 25.0
16. Difficulty awaiting turn 31.0 25.4 22.1
17. Forgetful in daily activities 11.5 10.2 10.2
18. Interrupts or intrudes 28.7 29.5 22.9

Symptom Count M(SD) M(SD) M(SD)

Inattentive (odd numbered items) 1.7 (2.4) 1.3 (2.2) 1.1 (2.1)
Hyperactive-Impulsive (even numbered items) 2.5 (2.5) 2.4 (2.5) 1.9 (2.4)

Note: Ns = 1096, 1062 and 1066 at ages 3-5, respectively; M = mean; SD = standard deviation