Govert Veldhuijzen

44 Chapter 2 Primary Outcome Bowel cleanliness was equal in the two groups with a mean total BBPS scores of 6.54 (± 1.69) in the nurse counselling group and 6.42 (± 1.62) in the CAI group. This is “good“ according to the scale. 17 According to OBPS the nurse counselling group scored 6.07 (± 2.53) and the CAI group 5.80 (± 2.90). Here, the score is “good-fair”. 18 (Table 2.) Both scales were scored in 60.8% of all cases. Comparative analysis of the 39.2% of patients with missing scores showed no significant difference on age, gender or educational level. Table 2. Primary Outcome: Bowel Cleanliness during Colonoscopy Nurse counselling (n, % scoring rate) Computer Assisted Instruction (n, % scoring rate) Nurse versus Computer Assisted Instruction (Mann- Whitney) Ottawa Bowel Preparation Scale (mean, SD) 6.07, ±2.53 (n=115, 58.4%) 5.80, ±2.90 (n=87, 46.3%) p = 0.418 Boston Bowel Preparation Scale (mean, SD) 6.54, ±1.69 (n=129, 65.5%) 6.42, ±1.62 (n=88, 46.8%) p = 0.576 Secondary Outcomes Comfort with the received information Patient comfort scores directly after counselling (T1) were 4.54±0.56 in the nurse counselling group and 4.17±0.51 in the CAI group (p < 0.0001). Patient comfort scores prior to colonoscopy (T2) were significantly higher in the CAI group compared to the nurse counselling group (4.42±0.68 vs 4.29±0.62, p=0.039). Patient comfort scores after colonoscopy (T3) were not different between groups. (Table 3.) Anxiety We found no significant differences between groups in the 5-point Likert anxiety scores at T1 (total mean 3.04±1.27) and T2 (total mean 2.84±1.30). (Table 3.) Knowledge and Comprehension The scores of the 10-question survey was not different among groups (7.31±1.11 vs 7.08±1.17, p=0.12). (Table 3.)