https://www.selleckchem.com/products/ca-170.html Introduction The PIBD-classes criteria were developed to standardize the classification of children with inflammatory bowel disease (IBD), from Crohn's disease (CD), through IBD-unclassified (IBD-U) to typical ulcerative colitis (UC). We aimed to further validate the criteria and to explore possible modifications. Methods This was a multi-center retrospective cohort study of children diagnosed with IBD with at least one year follow-up. Clinical, radiologic, endoscopic and histologic data were recorded at diagnosis and last follow-up, as well as the 23 items of the PIBD-classes criteria. The PIBD-classes criteria were assessed for redundant items and a simplified algorithm was proposed and validated on the original derivation cohort from which the PIBD-classes algorithm was derived. Results Of the 184 included children (age at diagnosis 13±3 years, 55% males), 122 (66%) were diagnosed by the physician with CD, 17 (9%) with IBD-U and 45 (25%) with UC. There was high agreement between physician-assigned and PIBD-classes-generated diagnosis for CD (93%; eight patients moved to IBD-U) and for UC (84%; 6 moved to IBD-U and one to CD). A simplified version of the algorithm with only 19 items is suggested, with comparable performance to the original algorithm (81% sensitivity and 81% specificity vs 78% and 83% for UC; and 79% and 95% vs 80% and 95% for CD, respectively). Conclusion The PIBD-classes algorithm is a useful tool to facilitate standardized objective classification of IBD subtypes in children. A modified version of the PIBD-classes maintains accuracy of classification with a simplified algorithm.Objectives A systematic review and meta-analysis was conducted to quantify the degree to which subjective age is associated with cognition, subjective wellbeing, and depression. Methods A systematic search was performed in three electronic social scientific databases, PsycINFO, Scopus, and Web of Science in May 2018. A manu