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.
Added by Joseph P.
Step 1
We have two groups: COPD patients and controls. We also have two exposures: welders and non-welders. The table will look like this: | | Welders | Non-Welders | Total | |-----------|---------|-------------|--------| | COPD | a | b Show more…
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