A cross-sectional study of 247 workers from 4 Chinese MSWLs was conducted. Noise and
total volatile organic compounds (TVOCs) levels at worksites were determined. We conducted
hearing examinations to determine hearing thresholds. A worker was identified as
having hearing loss if the mean threshold at 2000, 3000 and 4000 Hz in either ear was
equal to or greater than 25 dB. Prevalence of occupational hearing loss was then evaluated.
Using unconditional Logistic regression models, we estimated the odds ratios (ORs) of
MSWL work associated with hearing loss