Exposure to welding fumes and chronic renal diseases, a negative case-referent study
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It was observed that some patients with glomerulonephritis or interstitial nephritis were welders. A hypothesis that welding fumes were an occupational hazard was put forward and initiated the following case-referent study. 143 cases were defined as living males, age 25 to 65 years, with renal disease which caused renal biopsy from 1976–1982. Three population-based referents for each case were selected from the national register of the total population matched by sex, age and community. Exposure was assessd by means of a questionnaire. Only 7% of the cases and 12% of the referents did not answer the questionnaire. There were no differences in exposure rates between cases and referents, even if exposure restrictions were applied. The power of the case-referent study was high.
Key wordsWelding Occupational diseases Epidemiology Glomerulonephritis Interstitial nephritis
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