Govert Veldhuijzen

160 Chapter 8 Table 4. Continued. Factor Satisfaction score (mean, SD) p-value (statistical test) Experience of previous endoscopy  Yes  No 80.2 ± 9.8 77.2 ± 13.6 0.015* (independent t-test) Number of endoscopies before  ≤2  >2 79.3 ± 9.8 81.0 ± 9.7 0.019* (independent t-test) Daily life  Student  Paid employment  Self-employed  Househusband/housewife  Unemployed  Disabled  Retired 95.2 ± 0.0 80.5 ± 9.6 79.6 ± 9.3 74.2 ± 12.9 76.2 ± 5.4 73.2 ± 10.8 80.8 ± 10.9 0.034* (Kruskal Wallis) Last endoscopy  1-3 months ago  4-6 months ago  6-12 months ago  1-4 years ago  >5 years ago 80.9 ± 9.9 79.8 ± 10.8 76.3 ± 9.4 79.9 ± 10.3 79.7 ± 8.6 0.520 (Kruskal Wallis) DISCUSSION In this study, we systematically translated and validated the original GESQ into the Dutch language. Our study demonstrates that the D-GESQ is a valid instrument for quantitative assessment of satisfaction in patients undergoing upper endoscopy and/ or colonoscopy in the Netherlands. This is supported by a high level of internal consistency (Cronbach alpha 0.839) with homogenous clustering represented by high numbers of corrected item-component correlation, except the component hospital. The high construct validity is supported by the EFA. The principal component analysis of the EFA demonstrated a clustering into five components (information before endoscopy, pain and discomfort, skills and satisfaction, information after endoscopy and hospital). We found that the initial CFA in our population did not match with the model fit described in the original study. Therefore, our definitive D-GESQ questionnaire is now categorized in five domains while still containing 21 questions. These five domains