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Main characteristics of the population investigated.
| Cases | Controls | P value | |
|---|---|---|---|
| Number | 200 | 400 | — |
| Age mean ± SD median, range |
63.65, (10–92) | 63.5, (10–92) | NS |
| Male/female | 96/104 | 190/210 | NS |
| Left side | 95 | — | — |
| Right side | 103 | — | — |
| Bilateral | 2 | — | — |
| Mild hearing loss | 44 | — | — |
| Moderate | 92 | — | — |
| Severe | 33 | — | — |
| Profound | 31 | — | — |
