The purpose of a study published in Pediatric Gastroenterology, Hepatology & Nutrition was to describe the results of colon transit time (CTT) tests in children with chronic functional constipation based on highly refined data. This study included 190 out of 415 children who performed a colon transit time (CTT) test under the diagnosis of chronic constipation according to the Rome III criteria at Konkuk University Medical Center, Korea, from January 2006 to March 2015. The results revealed that the median value and interquartile range (IQR) of CTT was 54 (37.5) hours in the encopresis group and 40.2 (27.9) hours in the non-encopresis group. While the frequency of subtype between non-encopresis group and encopresis was statistically significant. The non-encopresis group (n=154, 81.1%) was divided into normal transit subgroup (n=84), outlet obstruction subgroup (n=18), and slow transit subgroup (n=52). The encopresis group (n=36, 18.9%) was divided, such as, normal transit subgroup (n=8), outlet obstruction subgroup (n=8), and slow transit subgroup (n=20). In summary, it was stated that this study provided the basic pattern and value of the CTT test in Korean children with chronic constipation.