In order to exclude any clinical factor that might not result in lower AMH level, single factor logistics analysis was used to determine whether any clinical factor, such as age, IBD type, extent colon type, behavior, complication, thalidomide usage, active index, HS-CRP level, ESR level, platelet level, hemoglobin, albumin, CDEIS, and BMI, significantly caused lower level of AMH level. This evidence concerns the gene CRP and inflammatory bowel disease.