An article titled “Does Vasectomy Cause Prostate Cancer?” (Chance, Vol. 10, No. 1)

reports on several large studies that found an increased risk of prostate cancer among men with vasectomies. In the absence of a direct cause, several researchers attribute the correlation to detection bias, in which men with vasectomies are more likely to visit the doctor and thereby are more likely to have any prostate cancer found by the doctor. Briefly explain how this detection bias could affect the claim that vasectomies cause prostate cancer.