RARRES2 and Crohn disease: To identify studies pertinent to this meta-analysis, we conducted a comprehensive search of PubMed, Embase, Web of Science, Wanfang, and China National Knowledge Infrastructure (CNKI) databases using an extensive array of search terms, which included: (1) “chemerin”; and (2) “inflammatory bowel disease” OR “IBD” OR “ulcerative colitis” OR “Crohn disease” OR “Crohn’s disease”.