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Figure 4. Effects of different factors on NIHL at 4 kHz in workers after dividing the subjects into lowrisk and high-risk groups based on median values. Abbreviations: E = noise exposure; C = low density serum cholesterol level, Sy = systolic blood pressure. 0 = below median 1 = above median

Figure 4. Effects of different factors on NIHL at 4 kHz in workers after dividing the subjects into lowrisk
and high-risk groups based on median values.
Abbreviations: E = noise exposure; C = low density serum cholesterol level, Sy = systolic blood
pressure. 0 = below median 1 = above median