Govert Veldhuijzen

110 Chapter 5 Table 3s. Indication for colonoscopy From the endoscopy reports data was collected on the indication for colonoscopy. This was subsequently categorized according to the indication groups commonly used. Indication for colonoscopy * Type of education Crosstabulation Type of education Total CBE Nurse Indication for colonoscopy Suspected inflammatory bowel disease Count 18 11 29 % within Indication for colonoscopy 62.1% 37.9% 100.0% Symptoms (anaemia, rectal bleeding, weight loss, etc) Count 177 126 303 % within Indication for colonoscopy 58.4% 41.6% 100.0% Surveillance Count 50 46 96 % within Indication for colonoscopy 52.1% 47.9% 100.0% Family history Count 21 19 40 % within Indication for colonoscopy 52.5% 47.5% 100.0% Other Count 9 14 23 % within Indication for colonoscopy 39.1% 60.9% 100.0% Positive faeces occult blood test Count 5 1 6 % within Indication for colonoscopy 83.3% 16.7% 100.0% Total Count 280 217 497 % within Indication for colonoscopy 56.3% 43.7% 100.0% Chi-Square Tests Value df Asymptotic Significance (2-sided) Pearson Chi-Square 6.411 a 5 0.268 Likelihood Ratio 6.598 5 0.252 N of Valid Cases 497 a. 2 cells (16.7%) have expected count less than 5. The minimum expected count is 2.62. Note: In the trial population, patients were not included who were referred for colonoscopy after a positive faeces occult blood test via the Dutch national colon cancer screening programme. This was due to regulatory reasons with regard to clinical research in these patients. Therefore, the number of primary screening colonoscopies and referrals with positive occult blood tests are very low in our population.