Women who began menstruating after the age of 17 years had a 1.8-fold risk (95% CI 1.03–3.24) of gallbladder cancer, compared with those with menarche at age 13 years or younger, but the trend test was borderline significant ( P -trend=0.05).
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Reproductive factors and risks of biliary tract cancers and stones: a population-based study in Shanghai, China.
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