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Risk factors in male infertility: a case-control study.
A case-control study was undertaken to evaluate environmental risk factors potentially involved in male infertility. One hundred twelve azoospermic or oligospermic subjects and 127 controls were interviewed, before sperm count results were available, about coffee and alcohol consumption, smoking habits, x-ray exposure, usual sitting posture, drug consumption, other nonoccupational risk factors, socioeconomic status, education level, and occupational history. An unmatched analysis was then conducted. None of the occupational risk factors appeared to be related to azoospermia or oligospermia. A high relative risk was associated with (1) occupation in the radioelectric industry, (2) nonsedentary clerical workers, (3) clerical work in the typographic industry, and (4) occupation in the textile industry, but none of these figures were statistically significant. Because of the population from which cases and controls were drawn, certain occupational risks could not be investigated in this study, e.g., exposure of agricultural workers to chemicals.
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