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The inverse relationship between cardiorespiratory fitness (CRF) and cancer mortality. Estimated mortality risks (95% confidence interval [95% CI]) were extrapolated from multivariate hazard ratio (breast and digestive cancers) and relative risk values (primarily lung and gastrointestinal [GI] cancers) in primary epidemiological studies: breast cancer (78), digestive cancer (79), and primarily lung and GI cancers (49).
