2. The association between job-related exposure to welding fumes and chronic obstructive pulmonary disease (COPD) was...

2. The association between job-related exposure to welding fumes and chronic obstructive pulmonary disease (COPD) was explored in a case-control study. The following data were reported for 399 COPD patients: 42 currently employed as welders; the remainder had no occupational exposure. Among the 700 controls, 47 were employed as welders. Set up a 2 by 2 table and calculate the OR.

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orchestra answered 1 year ago

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