Table 2

Prevalence of NIHL associated with complex noise versus Gaussian noise

AuthorGroupType of factoryPopulationNoise level
(max or mean)
(dB(A))
CNE(dB(A)·year)Kurtosis (mean±SD)NIHL (%)HFNIHL prevalence
NAge (years)Exposure duration (years)Male (%)HFNIHLSFNIHLNIDOR95% CI
Liu62GaussianClothing142132.8±6.93.6±2.179.993.4±5.099.1±8.29.26.80.830.61 to 1.11
ComplexHardware95732.5±8.34.1±1.878.093.1±4.299.0±7.87.76.3
Xie63GaussianTextile2635.7±8.29.8±5.976.995.1±1.3104.0±4.438.57.72.531.04 to 6.14
ComplexRolling9837.4±6.59.9±7.484.794.9±4.0103.5±6.361.217.4
Zheng64GaussianMachinery39933.6±9.911.6±8.670.2100.096.8±6.056.625.82.942.06 to 4.19
ComplexMachinery27130.6±8.810.1±8.286.7102.1104.8±5.079.339.1
Zhang65GaussianMachinery202100.093.4±1.513.40.59.135.60 to 14.89
ComplexMachinery212100.092.7±1.058.56.1
Zhao66GaussianTextile16331.5±8.712.7±8.4100.099.9±4.2110.6±6.03.3±0.364.41.060.48 to 2.34
ComplexMetal3235.1±7.212.3±7.137.595.2±3.1103.2±4.240.0±44.065.6
Xie67GaussianTextile16331.7±8.712.7±8.449.7101.2±4.7110.3±6.13.2±0.364.40.740.48 to 1.15
ComplexSteel17838.1±7.613.0±8.010093.6±5.7103.6±7.237.1±52.957.3
Zhang68GaussianPharmaceutical6236.8±6.666.192.2±5.397.6±5.532.32.591.13 to 5.96
ComplexForging3832.9±5.5100.095.2±3.997.0±6.455.3
TotalGaussian243632.9±7.96.5±6.692.196.3±6.1101.9±8.83.3±0.325.624.76.11.950.93 to 4.09
Complex178633.2±8.56.7±6.167.894.0±4.8103.3±6.533.0±51.734.533.36.2
  • CNE, cumulative noise exposure; 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.