Haemoccult screening for colorectal cancer: the effect of dietary restriction on compliance.

The aim of this study was to examine the effect of dietary restrictions on compliance with Haemoccult screening for colorectal carcinoma. One-hundred-and-fifty-three individuals were randomly allocated to perform Haemoccult tests with or without dietary restrictions, over 3 or 6 days. Those who failed to return completed tests within 6 weeks were sent a reminder letter. A small but significant improvement in compliance when testing over a 3-day period has been previously demonstrated but this difference was not seen in this study because of the small sample size. Overall, 72.8% compliance was achieved in those who were not asked to exclude certain foods during the test period compared with 51.8% in those in whom dietary restriction was requested (chi 2 = 7.45, P < 0.01). In a British population compliance with Haemoccult screening is adversely affected by the imposition of dietary restrictions.