Table 1.
Numbers of Probands in Studies
| Measure | Sample | 5% |
10% |
||
|---|---|---|---|---|---|
| Male, n (%) | Female, n (%) | Male, n (%) | Female, n (%) | ||
| Total ADHD | CATSS | 227 (70) | 95 (30) | 450 (69) | 201 (31) |
| TEDS | 146 (70) | 63 (30) | 291 (68) | 138 (32) | |
| Merged | 373 (70) | 158 (30) | 741 (69) | 339 (31) | |
| Hyperactivity/Impulsivity | CATSS | 208 (68) | 100 (32) | 382 (63) | 229 (37) |
| TEDS | 142 (69) | 65 (31) | 242 (63) | 140 (37) | |
| Merged | 350 (68) | 165 (32) | 624 (63) | 369 (37) | |
| Inattention | CATSS | 238 (69) | 109 (31) | 468 (66) | 237 (34) |
| TEDS | 141 (71) | 57 (29) | 255 (69) | 116 (31) | |
| Merged | 379 (70) | 166 (30) | 723 (67) | 353 (33) | |
Note: ADHD = attention-deficit/hyperactivity disorder; CATSS = Child and Adolescent Twin Study in Sweden; TEDS = Twins Early Development Study.