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Age Distribution among Workers with NIHL
| Worker's Age | No. Tested | No. with | No. without |
| NIHL (%) | NIHL (%) | ||
| 19–29 | 27 | 4 (15) | 23 (85) |
| 29.1–39 | 93 | 25 (27) | 68 (73) |
| 39.1–49 | 37 | 23 (62) | 14 (38) |
| 49.1+ | 12 | 10 (83) | 2 (17) |
| Total | 169 | 62 (37) | 107 (63) |
Chi square=30.99, df = 3, p<0.01
