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. Author manuscript; available in PMC: 2023 Jun 1.
Published in final edited form as: Res Child Adolesc Psychopathol. 2023 Jan 31;51(6):819–832. doi: 10.1007/s10802-023-01030-7

Table 1.

Descriptive Statistics Across Waves 1 Through 8

Wave 1 Wave 2 Wave 3 Wave 4 Wave 5 Wave 6 Wave 7 Wave 8
Males
 
 
 
 
 
 
 
 
Total N
525
337
334
226
229
249
224
177
% with ADHD
68.38
67.06
67.37
66.37
63.32
61.04
61.16
59.32
 
M
SD
M
SD
M
SD
M
SD
M
SD
M
SD
M
SD
M
SD
Age 9.68 1.54 10.44 1.50 11.50 1.53 12.53 1.50 13.73 1.49 14.32 1.42 15.12 1.35 15.59 0.88
Pubertal Stage 1.41 0.60 1.49 0.73 1.86 0.99 2.02 1.21 2.89 1.30 3.34 1.24 3.81 1.04 4.18 0.83
Inattention 4.51 3.39 4.34 3.61 3.82 3.46 5.06 3.47 4.17 3.39 2.86 3.23 2.14 3.16 1.13 2.80
Hyperactivity 2.28 2.07 2.00 2.09 1.47 1.84 2.06 1.44 1.26 1.70 0.99 1.62 0.64 1.50 0.25 0.71
Impulsivity 1.05 1.19 1.03 1.17 0.74 1.05 0.94 0.93 0.61 0.94 0.53 0.95 0.21 0.58 0.25 0.71
Depression 8.20 6.35 7.54 6.72 5.86 5.61 7.25 6.40 6.66 5.74 6.93 6.35 6.75 6.19 6.90 6.71
Impairment 71.99 12.78 72.70 12.00 74.55 11.76 74.95 12.01 74.96 12.87 77.32 11.61 79.04 12.62 79.30 14.86
Females
Total N 324 195 196 137 121 150 137 128
% with ADHD 46.30 51.28 48.98 47.45 47.93 42.67 40.88 38.28
M SD M SD M SD M SD M SD M SD M SD M SD
Age 9.62 1.58 10.28 1.50 11.31 1.44 12.34 1.49 13.38 1.47 14.02 1.24 14.98 1.19 15.67 0.98
Pubertal Stage 1.94 0.95 1.92 0.94 2.40 1.05 3.13 1.39 3.57 1.10 4.03 0.79 4.41 0.65 4.64 0.55
Inattention 3.31 3.60 2.85 3.29 2.57 3.07 3.11 3.82 3.63 3.50 1.92 2.74 2.33 2.25 2.23 3.22
Hyperactivity 1.40 1.92 1.17 1.85 0.94 1.57 1.33 1.66 0.83 1.43 0.44 0.97 0.67 1.63 0.54 1.05
Impulsivity 0.69 1.04 0.63 1.05 0.47 0.85 0.78 1.20 0.46 0.96 0.36 0.74 0.50 0.84 0.15 0.38
Depression 7.28 6.63 7.66 6.96 6.62 6.45 8.81 8.62 10.11 9.28 9.84 8.51 9.72 9.11 8.62 7.03
Impairment 76.63 11.95 77.50 11.69 77.76 10.89 79.31 12.69 78.31 11.79 79.11 13.16 78.75 9.83 80.49 11.49

Note. Inattention, hyperactivity, and impulsivity symptom counts were determined using the KSADS data. Depression refers to total raw scores on the CDI. Impairment was determined utilizing the GAF based on parent responses from the KSADS.