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Duration of headphone/earphone usage and hearing threshold
| Duration of HP/EP usage | Hearing threshold | χ 2 | P value | |
|---|---|---|---|---|
| Normal HT | Abnormal HT | |||
| <2 years | 51 (85.0%) | 9 (15.0%) | ||
| 2–4 years | 56 (77.8%) | 16 (22.2%) | 1.469 | 0.480 |
| >4 years | 117 (83.6%) | 23 (16.4%) | ||
| Total | 224 | 48 | ||
HP/EP: headphones/earphones, HT: hearing threshold
