Table 1.
Demographic data and disease characteristics (by age group).
| Age | 6-12 years N = 583 |
13-18 years N = 239 |
All patients N = 822 |
U-test1 Chi2-test2 |
|---|---|---|---|---|
| Gender, n (%) | p = 0.4602 | |||
| Female | 84 (14.41) | 40 (16.74) | 124 (15.09) | |
| Male | 499 (85.59) | 199 (83.26) | 698 (84.91) | |
| Age at study start (years) | ||||
| mean ± SD | 9.75 ± 1.59 | 14.38 ± 1.29 | 11.10 ± 2.58 | p < 0.0011 |
| minimum, median, maximum | 6,10,12 | 13,14,18 | 6,11,18 | |
| Age at study start (years) by group, n (%) | ||||
| 6-9 | 251 (43.05) | 0 (0.00) | 251 (30.54) | |
| 10-12 | 332 (56.95) | 0 (0.00) | 332 (40.39) | |
| 13-15 | 0 (0.00) | 197 (82.43) | 197 (23.97) | |
| 16-18 | 0 (0.00) | 42 (17.57) | 42 (5.11) | |
| Age at first diagnosis of disease (years) | p < 0.0011 | |||
| valid N | 565 | 220 | 785 | |
| mean ± SD | 7.31 ± 1.85 | 9.97 ± 2.86 | 8.06 ± 2.49 | |
| minimum, median, maximum | 2,7,12 | 1.0,10.0,16.0 | 1.0,8.0,16.0 | |
| Duration of disease at study start (years) | p < 0.0011 | |||
| valid N | 565 | 220 | 785 | |
| mean ± SD | 2.41 ± 1.56 | 4.27 ± 2.71 | 2.93 ± 2.12 | |
| minimum, median, maximum | 0.03,2.1,7.9 | 0.17,3.8,12 | 0.03,2.51, 12 | |
| Diagnosis of ADHD (ICD-10) n (%)3 | ||||
| F90.0: disturbance of activity and attention | 364 (62.44) | 155 (64.85) | 519 (63.14) | p = 0.5672 |
| F90.1: hyperkinetic conduct disorder | 227 (38.94) | 89 (37.24) | 316 (38.44) | p = 0.7072 |
| F90.8: other hyperkinetic disorder | 8 (1.37) | 6 (2.51) | 14 (1.70) | p = 0.3962 |
| F90.9: hyperkinetic disorder, unspecified | 18 (3.09) | 3 (1.26) | 21 (2.55) | p = 0.2052 |
| others | 41 (7.03) | 24 (10.04) | 65 (7.91) | p = 0.2872 |
| Previous and/or concomitant diseases (ICD-10) n (%)3 | ||||
| No | 351 (60.21) | 145 (60.67) | 496 (60.34) | p = 0.9642 |
| Others | 47 (8.06) | 26 (10.87) | 73 (8.88) | |
| F91.X: conduct disorder | 134 (22.98) | 53 (22.18) | 187 (22.75) | p = 0.2882 |
| F91: incl. F91.3 oppositional defiant disorder | 103 (17.67) | 37 (15.48) | 140 (17.03) | p = 0.5122 |
| F41: anxiety disorder | 25 (4.29) | 7 (2.93) | 32 (3.89) | p = 0.5342 |
| F42: obsessive-compulsive disorder | 12 (2.06) | 3 (1.26) | 15 (1.82) | p = 0.5992 |
| F1X: substance abuse | 0 (0.00) | 6 (2.51) | 6 (0.73) | p = 0.0012 |
1,2 p-values from the corresponding test between age groups: 6-12 years and 13-18 years
3 multiple responses possible; Chi2-test always yes vs. no