Risk factors for colonic and rectal cancer mortality: evidence from 40 years’ follow-up in the Whitehall I study: Table 1

Abstract

Smoking significantly increases mortality from colorectal cancer and its decreasing prevalence in the UK may partly explain falling mortality from the disease. Changes in health behaviours in response to early cancer symptoms may result in differential misclassification or 'reverse causality' unless early events are excluded. Although many individual cohort studies have not shown significant relationships between behavioural risk factors and colorectal cancer mortality, their contribution to meta-analyses remains important.