[A case-control study of peptic ulcer risk factors: smoking]

The 1:1 matched case-control study was undertaken. The associated risk factors such as smoking etc were investigated. Three hundred cases of peptic ulcer and 300 controls individually matched were interviewed. Conditional logistic regression was employed to examine the effect modification. The analytic results showed that Smoking, family history, nutrition, anxiety and depression were the risk factors of peptic ulcer. No relation was found between blood types and peptic ulcer.