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Exposure to chlorine gas can cause many problems for people who work in chlorine chemical production factories. The present study was conducted to investigate the prevalence of laryngeal and voice symptoms and related factors among workers in a chlorine chemical production factory.

A case-control study.

A total number of 208 workers, including 138 workers (13 females, 125 males) who work in a chlorine chemical production factory and 70 (three females, 67 males) workers of a non-chlorine producing factory (producing metal materials), participated in the study. All participants completed self-reported questionnaires to investigate laryngeal or voice problems. These questionnaires investigated workplace vocal health, presence of voice or laryngeal problems, voice symptoms and laryngeal discomforts, and complications of voice problems.

The prevalence of …