Table 3 Power calculation assumptions around exposure of cases and controls to bowel cancer screening (percentages)
From: An ongoing case–control study to evaluate the NHS Bowel Cancer Screening Programme
% | Cases Screened | Cases Not Screened | Total |
|---|---|---|---|
Controls - Screened | 39 | 20 | 59 |
Controls - Not screened | 16 | 25 | 41 |
Total | 55 | 45 | 100 |