title: Colon Transit Time Test in Korean Children with Chronic Functional Constipation.
abstract: OBJECTIVE
  Each ethnic group has a unique life style, including diets. Life style affects bowel movement. The aim of this study is to describe the results of colon transit time (CTT) tests in Korean children who had chronic functional constipation based on highly refined data.
  
  
  METHODS
  One hundred ninety (86 males) out of 415 children who performed a CTT test under the diagnosis of chronic constipation according to Rome III criteria at Konkuk University Medical Center from January 2006 through March 2015 were enrolled in this study. Two hundreds twenty-five children were excluded on the basis of CTT test result, defecation diary, and clinical setting. Shapiro-Wilk and Mann-Whitney U, and chi-square tests were used for statistical analysis.
  
  
  RESULTS
  The median value and interquartile range (IQR) of CTT was 54 (37.5) hours in Encopresis group, and those in non-encopresis group was 40.2 (27.9) hours (p<0.001). The frequency of subtype between non-encopresis group and encopresis was statistically significant (p=0.002). The non-encopresis group (n=154, 81.1%) was divided into normal transit subgroup (n=84, 54.5%; median value and IQR of CTT=26.4 [9.6] hours), outlet obstruction subgroup (n=18, 11.7%; 62.4 [15.6] hours), and slow transit subgroup (n=52, 33.8%; 54.6 [21.0] hours]. The encopresis group (n=36, 18.9%) was divided into normal transit subgroup (n=8, 22.2%; median value and IQR of CTT=32.4 [9.9] hours), outlet obstruction subgroup (n=8, 22.2%; 67.8 [34.8] hours), and slow transit subgroup (n=20, 55.6%; 59.4 [62.7]hours).
  
  
  CONCLUSIONS
  This study provided the basic pattern and value of the CTT test in Korean children with chronic constipation.
authors.affiliation: Department of Pediatrics, Konkuk University School of Medicine, Seoul, Korea.
authors.forename: Ha Yeong
authors.initials: HY
authors.lastname: Yoo
authors.affiliation: Department of Pediatrics, Konkuk University School of Medicine, Seoul, Korea.
authors.forename: Mock Ryeon
authors.initials: MR
authors.lastname: Kim
authors.affiliation: Department of Pediatrics, Konkuk University School of Medicine, Seoul, Korea.
authors.forename: Hye Won
authors.initials: HW
authors.lastname: Park
authors.affiliation: Department of Pediatrics, Konkuk University School of Medicine, Seoul, Korea.
authors.forename: Jae Sung
authors.initials: JS
authors.lastname: Son
authors.affiliation: Department of Pediatrics, Konkuk University School of Medicine, Seoul, Korea.
authors.forename: Sun Hwan
authors.initials: SH
authors.lastname: Bae
keywords: Child; Colon transit; Constipation; Defecation diary; Encopresis; Korea