| Etiologies | prosthetic pure tonal gain | P | |
| <30 dB n = 157 | >30 dB n = 379 | ||
| Meningitis | 22 (15.9%) | 71 (18.7%) | 0.44 |
| Presbyacusis | 21 (13.4%) | 73 (19.3%) | 0.10 |
| Chronic otitis media | 20 (12.7%) | 45 (11.9%) | 0.77 |
| Ototoxicity | 18 (11.4%) | 27 (7.1%) | 0.09 |
| Sound trauma | 7 (4.5%) | 36 (9.5%) | <0.05 |
| Cranial trauma | 14 (8.9%) | 26 (6.9%) | 0.40 |
| Sudden hearing loss | 5 (3.1%) | 31 (8.2%) | <0.05 |