Table 1.
Basic characteristics of subjects under study by group
| Characteristics | Factory A n=60 (%) | Factory B n=60 (%) | Factory C n=60 (%) | p-value |
|---|---|---|---|---|
| Noise exposure level (dB (A) ) | 0.080 | |||
| <86 | 29 (48.3) | 19 (31.7) | 19 (31.7) | |
| >86-90 | 23 (38.3) | 37 (61.7) | 36 (60) | |
| >90 | 8 (13.3) | 4 (6.7) | 5 (8.3) | |
| Audiogram (average 3000-8000 Hz) | 0.170 | |||
| ≤25 dB | 49 (81.7) | 41 (68.3) | 48 (80.0) | |
| >25 dB | 11 (18.3) | 19 (31.7) | 12 (20.0) | |
| Age (years) | 0.496 | |||
| 20-30 | 13 (21.7) | 18 (30.0) | 18 (30.0) | |
| >30-50 | 47 (78.3) | 42 (70.0) | 42 (70.0) | |
| Education level | 0.336 | |||
| Junior High School | 18 (30.0) | 16 (26.7) | 25 (41.7) | |
| Senior High School | 24 (40.0) | 25 (41.7) | 16 (26.7) | |
| >Vocational Certificate | 18 (30.0) | 19 (31.7) | 19 (31.7) | |
| Pack-year smoking | 0.477 | |||
| <10 | 54 (90.0) | 54 (90.0) | 52 (86.7) | |
| ≥10 | 6 (10.0) | 6 (10.0) | 8 (13.3) | |
| Music earbuds use | 0.002 | |||
| No | 26 (43.3) | 41 (68.3) | 23 (38.3) | |
| Yes | 34 (56.7) | 19 (31.7) | 37 (61.7) | |
| Job position | 0.003 | |||
| Leader | 14 (23.3) | 22 (36.7) | 6 (10.0) | |
| Worker | 46 (76.7) | 38 (63.3) | 54 (90.0) | |
| Duration of employment (years) | 0.906 | |||
| <10 | 47 (78.3) | 46 (76.7) | 48 (80.0) | |
| >10 | 13 (21.7) | 14 (23.3) | 12 (20.0) | |
| Noise level perception in current job | 0.114 | |||
| Low | 34 (56.7) | 26 (43.3) | 23 (38.3) | |
| High | 26 (43.3) | 34 (56.7) | 37 (61.7) | |
| Noise level perception in previous job | 0.105 | |||
| Low | 41 (68.3) | 30 (50) | 38 (63.3) | |
| High | 19 (31.7) | 30 (50) | 22 (36.7) | |
| Previous earplug use | 0.001 | |||
| No | 49 (81.7) | 56 (93.3) | 60 (100) | |
| Yes | 11 (18.3) | 4 (6.7) | 0 |