Table 1.
Comparisons between participants and nonparticipants within the originally selected sample on preschool measures
| Participants | Nonparticipants | t score | p value | ||||
|---|---|---|---|---|---|---|---|
| n | Mean (SD) | N | Mean (SD) | ||||
| Hyperactive males | WWP Hyperactivity | 81 | 27.51 (6.74) | 236 | 28.23 (7.65) | −.76 | .45 |
| BCL Conduct problems | 77 | 2.95 (1.45) | 218 | 3.33 (1.70) | −1.88 | .06 | |
| BCL Emotional problems | 77 | 1.34 (1.13) | 219 | 1.51 (1.28) | −1.04 | .30 | |
| Carstairs deprivation | 80 | −1.06 (1.78) | 201 | −1.05 (1.96) | −.04 | .97 | |
| Hyperactive females | WWP Hyperactivity | 89 | 27.80 (7.95) | 137 | 28.21 (7.68) | −.39 | .70 |
| BCL Conduct problems | 82 | 2.71 (1.64) | 126 | 2.79 (1.64) | −.30 | .77 | |
| BCL Emotional problems | 82 | 1.32 (1.22) | 125 | 1.54 (1.44) | −1.13 | .26 | |
| Carstairs deprivation | 87 | −.92 (1.97) | 113 | −.95 (1.78) | −.12 | .91 | |
| Control males | WWP Hyperactivity | 40 | 7.90 (5.01) | 118 | 10.66 (5.07) | −2.99 | <.01 |
| BCL Conduct problems | 40 | 1.43 (.93) | 118 | 1.81 (1.25) | −1.74 | .08 | |
| BCL Emotional problems | 40 | .88 (1.07) | 118 | 1.04 (1.12) | −.83 | .41 | |
| Carstairs deprivation | 39 | −.85 (2.03) | 116 | .15 (2.51) | −2.25 | .03 | |
| Control females | WWP Hyperactivity | 48 | 8.43 (4.71) | 92 | 9.51 (5.09) | −1.23 | .22 |
| BCL Conduct problems | 47 | 1.21 (1.10) | 93 | 1.56 (1.09) | −1.77 | .08 | |
| BCL Emotional problems | 47 | .80 (.94) | 93 | .94 (.89) | −.85 | .40 | |
| Carstairs deprivation | 48 | −1.26 (2.38) | 89 | −.41 (2.53) | .63 | .53 | |