Associations of colon and rectal cancers with most of these covariates, such as age, education, household income, family history of CRC, tea consumption, cigarette smoking, intake of fruits and vegetables, were statistically significant or of borderline significance in this study (data not shown).
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Body weight, fat distribution and colorectal cancer risk: a report from cohort studies of 134255 Chinese men and women.
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Tests for linear trend were highly significant ( P for trend<0.001 for all).