Abstract
Early detection of developmental delay and childhood disorders are important for early intervention. This study aimed to describe the distribution of responses in a large population-based survey, identify cutoff points for the parent concern checklist (PCC) suitable for the Chinese language and culture, and explore how many children were identified as having evidence of problems at age 18 mo different from those at age 6 mo. Using a national randomly selected sample, the overall development of 21,248 children was investigated using the Taiwan Birth Cohort study instrument, and the PCC, a problem-oriented screening instrument. The Newton-Raphson iteration showed that the PCC should be separated into three groups, those scoring 1-2 in the first group, 3- 6 in the second group, and 7- 8 in the third group.Structural equation models showed that 6-mo development was predictive of 18-mo development; additionally, 18-mo development and the PCC showed good concurrent validity. This study identified three groups with distinct developmental trajectories and two cutoff points of 2/3 and 6/7. Thus, the PCC can be used as a first-stage screening instrument in a two-stage window screening procedure. Further studies are needed to investigate the factors, which contribute to the differences among these groups;follow-up on the typical and atypical development of these children is necessary.
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