title: Single-center experience of the Korean-Developmental Screening Test for infants and children.
abstract: OBJECTIVE
  We investigated the number of test takers of the Korean-Developmental Screening Test (K-DST) in a single children's hospital within a year, according to age, referral rate, and follow-up percentage.
  
  
  METHODS
  For this study, 4,062 children who visited and received K-DST at Woorisoa Children's Hospital between January and December 2015 were enrolled. Seven test sets were used according to the Korean National Health Screening Program for infants and children in the following age groups: 4 to 6, 9 to 12, 18 to 24, 30 to 36, 42 to 48, 54 to 60, and 66 to 71 months. The results of the K-DST were categorized into 4 groups as follows: further evaluation (<-2 standard deviation [-2SD]), follow-up test (-2SD to -1SD), peer level (-1SD to 1SD), and high level (>1SD).
  
  
  RESULTS
  The test participants' population and follow-up population were concentrated before the age of 24 months (2,532, 62.3%). The children most commonly referred for further evaluation were those in the 30- to 41-month age group. A mismatch was found between the results of the K-DST and the additional questions. Most of the infants and children with suspicious developmental delays showed catch-up development in their follow-up tests (43 of 55, 78.2%).
  
  
  CONCLUSIONS
  The use of K-DST should be encouraged, especially among children aged over 24 months. Multiple-choice question format for the additional questions is recommended to avoid confusion. We suggest a nationwide study to evaluate and revise the K-DST.
authors.affiliation: Department of Pediatrics, Korea University College of Medicine, Seoul, Korea.
authors.forename: Chae-Ri
authors.initials: CR
authors.lastname: Suh
authors.affiliation: Woorisoa Children's Hospital, Seoul, Korea.
authors.forename: Su Ye
authors.initials: SY
authors.lastname: Sohn
authors.affiliation: Department of Pediatrics, Korea University College of Medicine, Seoul, Korea.
authors.forename: Gun-Ha
authors.initials: GH
authors.lastname: Kim
authors.affiliation: Woorisoa Children's Hospital, Seoul, Korea.
authors.forename: Seong-Kwan
authors.initials: SK
authors.lastname: Jung
authors.affiliation: Department of Pediatrics, Korea University College of Medicine, Seoul, Korea.
authors.forename: Baik-Lin
authors.initials: BL
authors.lastname: Eun
keywords: Child; Development; Infant; Korea; Screening tests