TABLE II.
Assessment of intelligence and neurocognitive function
| Measure (n) | Hearing Loss1 | No Hearing Loss1 |
||
|---|---|---|---|---|
| N (%) | Mean±SE | Mean±SE | p2 | |
| Full Scale IQ | 47 (81) | 85±3.2 | 93±2.7 | 0.038 |
| Verbal Comprehension Index | 47 (81) | 88±3.3 | 95±3.1 | 0.082 |
| Similarities or Word Reasoning | 50 (86) | 8.6±0.7 | 10.0±0.7 | 0.048 |
| Vocabulary/ Receptive Vocabulary | 53 (91) | 6.6±0.6 | 8.2±0.6 | 0.039 |
| Comprehension/Information Subtest | 35 (60) | 7.0±0.9 | 8.9±0.7 | 0.057 |
| Perceptual Reasoning Index/Performance | 50 (86) | 88±2.6 | 100±2.7 | 0.003 |
| Block Design | 53 (91) | 7.5±0.5 | 9.3±0.6 | 0.011 |
| Picture Concepts, Visual Puzzle, Object assembly | 28 (48) | 9.1±1.0 | 10.5±0.5 | 0.149 |
| Matrix Reasoning | 42 (72) | 9.0±0.6 | 10.5±0.7 | 0.048 |
| Working Memory Index | 38 (66) | 84±2.8 | 95±2.7 | 0.003 |
| Digit Span3 | 42 (72) | 6.9±0.5 | 9.5±0.6 | <0.001 |
| L-N Sequence/ Arithmetic | 27 (47) | 7.4±0.7 | 8.6±0.5 | 0.138 |
| Processing Speed Index4 | 46 (79) | 78±4.3 | 85±2.8 | 0.126 |
| Coding | 47 (81) | 5.8±0.6 | 7.1±0.6 | 0.059 |
| Symbol Search | 46 (79) | 6.5±0.7 | 7.7±0.6 | 0.044 |
| Visual Motor Integration | 23 (40) | 72±4.8 | 92±5.6 | 0.102 |
1
Significant hearing loss defined as Chang Grade ≥2b.
2
Wilcoxon or unpaired 1-tailed t-test, significance set at α<0.05 (bolded).
3
Digit span forward and digit span backward compared with no significant differences.
4
One subject recorded a “0,” analysis run above as lowest reportable value (40), repeated as “0” with no significant change in results.
L-N Sequence = Letter-Number Sequencing.