Results: Among cotton workers, the cumulative incidence of byssinosis and chest tightness was 24% and
23%, respectively, and was significantly more common in smokers than in non-smokers. A high proportion
of symptoms was found to be intermittent, rather than persistent. Among silk workers, no typical byssinosis
was identified; the incidence of chest tightness was 10%. Chronic bronchitis, cough, and dyspnoea were
more common and persistent in the cotton group than in the silk group. Significantly lower odds ratios for
symptoms were observed in cotton workers who left the cotton mills; risk was also related to years since last
worked. Multivariate analysis indicated a trend for higher cumulative exposure to endotoxin in relation to
a higher risk for byssinosis
Results: Among cotton workers, the cumulative incidence of byssinosis and chest tightness was 24% and
23%, respectively, and was significantly more common in smokers than in non-smokers. A high proportion
of symptoms was found to be intermittent, rather than persistent. Among silk workers, no typical byssinosis
was identified; the incidence of chest tightness was 10%. Chronic bronchitis, cough, and dyspnoea were
more common and persistent in the cotton group than in the silk group. Significantly lower odds ratios for
symptoms were observed in cotton workers who left the cotton mills; risk was also related to years since last
worked. Multivariate analysis indicated a trend for higher cumulative exposure to endotoxin in relation to
a higher risk for byssinosis
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