Question: A case-control study claimed to have found a relationship between drinking coffee and pancreatic cancer. The cases were people recently hospitalized with pancreatic cancer, and

A case-control study claimed to have found a relationship between drinking coffee and pancreatic cancer. The cases were people recently hospitalized with pancreatic cancer, and the controls were people hospitalized for other reasons.

When asked about their coffee consumption for the past year, it was found that the cancer cases drank more coffee than the controls. Give a reasonable explanation for this difference other than a relationship between coffee drinking and pancreatic cancer.

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