Supplementary Material for: Validation of a Revised Knowledge Assessment Tool for Children with Inflammatory Bowel Disease (IBD-KID2)

<b><i>Introduction:</i></b> For children with inflammatory bowel disease (IBD), acquired knowledge of their condition and treatment is integral to their adherence and self-management. Assessing their knowledge is vital to identify deficits that may affect disease management. IBD-KID2 is a knowledge assessment tool written for children aged 8 years and over with IBD. <b><i>Objectives:</i></b> In order to examine validity and reliability, a study was carried out using IBD-KID2 in a paediatric IBD population and a number of comparator groups with established levels of IBD knowledge. <b><i>Methods:</i></b> IBD-KID2 was administered to 4 participant groups in Christchurch Hospital, New Zealand: children with IBD (<i>n</i> = 22), children without IBD (<i>n</i> = 20), medical staff (<i>n</i> = 15), and administration staff (<i>n</i> = 15). Between-group differences were tested using ANOVA and pairwise comparisons made with the IBD group. Repeat assessments by the IBD group determined test-retest reliability (<i>n</i> = 21). <b><i>Results:</i></b> The mean age (range) of the paediatric groups were: IBD 13.3 years (8–18), without IBD 11.9 years (8–15). Group mean scores (SD) were: IBD 8.5 (±2.3), without IBD 3.7 (±2.2), medical staff 13.5 (±1.3), administration staff 6.3 (±2.5). Group means were all significantly different to the IBD group. Test-retest mean at baseline (8.4, CI ±2.4) and repeat (9.0, CI ±2.4) were not significant. Intraclass correlation<b><i></i></b>coefficient was 0.82. Internal reliability was 0.85, and item-total statistics showed no improvement by specific item removal. <b><i>Conclusions:</i></b> IBD-KID2 could distinguish between groups with different knowledge levels. Repeat assessment shows comparable scores on retest and good reproducibility. IBD-KID2 is a valid and reliable tool for use in the paediatric IBD population.