The IQs of ten youngsters with severe learning difficulties were tested on the South African Intelligence Scale before starting with Audiblox, and again after receiving 40 hours of one-on-one instruction. Their ages were between 7 and 18.
While 40 hours of Audiblox instruction is not enough to overcome a learning difficulty, it is usually enough to start seeing results on standardized tests. The increases in verbal, non-verbal and full scale IQ are highly significant according to the two-tailed t-test.
| Before | After | ||
| Verbal IQ Subtests | |||
| Vocabulary | 7.6 | 7.9 | |
| Comprehension | 10.0 | 10.8 | |
| Verbal Reasoning | 9.1 | 10.0 | |
| Problems | 6.3 | 6.8 | |
| Memory | 8.5 | 10.5 | |
| Mean Verbal IQ | 85.4 | 91.0 | Significant at the 0.001 level |
| Non-Verbal IQ Subtests | |||
| Pattern Completion | 8.4 | 8.7 | |
| Block Design | 8.2 | 10.3 | |
| Absurdities | 9.4 | 9.6 | |
| Form Board | 11.1 | 15.3 | |
| Mean Non-Verbal IQ | 92.6 | 105.1 | Significant at the 0.001 level |
| MEAN FULL SCALE IQ | 87.0 | 97.1 | Significant at the 0.001 level |