212 patients with colorectal cancer will be investigated before surgery and 100 of them after surgery. 597 individuals from a previous population based study will serve as controls to the prevalence of sleep apnea in the general population. Investigations will include polysomonographic sleep apnea recordings during one night, lung function measurements, blood gas samples and questionnaires. Controls: Men and women from two population-based cohort studies
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Prevalence of sleep apnea
Timeframe: 1 week