Table 8:
Results analysis of the investigated studies
| Variable | Frequency | Missing | Mean± SD |
|---|---|---|---|
| Work experience(year) | 31 | 0 | 13.13 ± 7.84 * |
| Age(year) | 22 | 9 | 37.59 ± 12.62 * |
| L eq8h [dB(A)] | 20 | 11 | 90.29 ± 2.45 * |
| Overall hearing loss (dB) | 21 | 10 | 26.44 ± 8.09 * |
| Right ear hearing loss(dB) | 17 | 14 | 19.36±6.85 ** |
| Left ear hearing loss(dB) | 18 | 13 | 20.02±6.59 ** |
| Left ear hearing loss, frequency 500 Hz (dB) | 11 | 20 | 17.12±6.21 ** |
| Left ear hearing loss, frequency 1000 Hz (dB) | 11 | 20 | 25.28±4.78 ** |
| Left ear hearing loss, frequency 2000 Hz (dB) | 11 | 20 | 15.37±5.30 ** |
| Left ear hearing loss, frequency 3000 Hz (dB) | 6 | 25 | 19.59±5.38 ** |
| Left ear hearing loss, frequency 4000 Hz (dB) | 11 | 20 | 24.38±7.84 ** |
| right ear hearing loss, frequency 500 Hz (dB) | 10 | 21 | 17.15±7.60 ** |
| right ear hearing loss, frequency 1000 Hz (dB) | 10 | 21 | 15.23±5.15 ** |
| right ear hearing loss, frequency 2000 Hz (dB) | 10 | 21 | 14.58±3.35 ** |
| right ear hearing loss, frequency 3000 Hz (dB) | 5 | 26 | 17.67±3.59 ** |
| right ear hearing loss frequency 4000 Hz (dB) | 10 | 21 | 22.25±7.45 ** |
*
Weighted for case numbers in each studies
**
Un-Weighted