Summary of the epidemiological characteristics of occupational NIHL in China
| Group | Type of industry | Population | Noise level (max or mean)(dB(A)) | NIHL (%) | ||||||
| N | Age (years) | Exposure duration (years) | Male (%) | HFNIHL | SFNIHL | NID | Average | |||
| Cross-sectional study77–81 | Transportation | 5810 | 39.9±6.8 | 17.9±10.6 | 93.0 | 93.0 | 11.6 | 5.6 | 5.9 | 8.9 |
| Cross-sectional study82–85 | Mining | 2245 | 34.4±9.3 | 8.0±4.0 | 100.0 | 106.2 | 65.1 | 7.0 | 10.3 | 34.2 |
| Cross-sectional study44 86–118 | Manufacturing | 34 656 | 32.6±8.9 | 7.9±6.3 | 81.6 | 96.2±5.1 | 30.9 | 8.5 | 7.1 | 23.1 |
| Cross-sectional study with references119–145 | Manufacturing | 18 319 | 33.9±9.4 | 12.6±9.8 | 81.4 | 102.2±7.2 | 28.7 | 10.0 | 2.3 | 19.6 |
| Complex noise62–68 | Manufacturing | 4222 | 33.0±8.2 | 6.6±6.4 | 81.8 | 95.2±5.6 | 29.4 | 28.7 | 6.2 | 21.0 |
| Co-exposure69–76 | Manufacturing | 6613 | 33.4±4.7 | 12.0±7.6 | 84.0 | 90.4±7.0 | 39.9 | 6.3 | 1.9 | 25.4 |
| Total | – | 71 865 | 33.5±8.7 | 9.9±8.4 | 82.7 | 98.6±7.2 | 30.2 | 9.0 | 5.8 | 21.3 |
dB(A), A-weighted decibels; HFNIHL, high-frequency noise-induced hearing loss; NID, noise-induced deafness; NIHL, noise-induced hearing loss; SFNIHL, speech-frequency noise-induced hearing loss.