Figure 3
From: Relationship of cigarette smoking and hearing loss in workers exposed to occupational noise
Hearing thresholds of the subjects according to smoking status after adjusting for confounding variables. * Bar: the mean of hearing threshold and error range (±5%) of the both ear at all frequency. †Confounding variables: age, working period, noise level, body mass index, mean arterial pressure, fasting blood glucose, total cholesterol, triglyceride, HDL cholesterol, hemoglobin.