Table 4.
Summary of school outcomes among ADHD subjects, by level of IQ.
| Outcome | High IQ (N=34) | Normal IQ (N=276) | Low IQ (N=21) | P-value |
|---|---|---|---|---|
| Reading score, national percentile | <0.001 | |||
| No. with available scores | 33 | 263 | 17 | |
| Mean (SD) | 74.6 (23.3) | 42.5 (25.2) | 26.9 (17.4) | |
| Median | 77.0 | 42.0 | 29.0 | |
| Range | (13.0–99.0) | (1.0–97.0) | (1.0–61.0) | |
| Cumulative incidence of being retained (%) | 0.47 | |||
| By age 9 years | 2.9 | 5.9 | 14.3 | |
| By age 12 years | 6.0 | 9.3 | 19.3 | |
| By age 15 years | 9.2 | 11.3 | 19.3 | |
| By age 18 years | 12.5 | 20.5 | 24.7 | |
| Dropped out of school, N (%) † | 3/28 (10.7) | 59/223 (26.5) | 5/19 (26.3) | 0.19 |
| Type of educational intervention, n (%) | 0.13 | |||
| EBD or both | 7 (20.6) | 78 (28.3) | 6 (28.6) | |
| Non-EBD | 11 (32.4) | 103 (37.3) | 12 (57.1) | |
| None | 16 (47.1) | 95 (34.4) | 3 (14.3) |
†
Subjects who emigrated from the school district prior to graduation or who had unknown graduation status were not included in the denominator for the determination of the percentage of subjects who dropped out of school.
EBD, emotional/behavior disturbance.