Objective: To conduct a feasibility and psychometric properties study by assessing the validity, sensitivity, specificity, and length of time answering the Ages & Stages Questionnaire, Third Edition (ASQ-3, Thai version) to pinpoint developmental progress in children aged 12, 30, and 36 months and compare it with the standardized Bayley-III.

Materials and Methods: Three hundred participants, who were the parents of children aged 12, 30, and 36 months old, and the children engaged in the present research. They were divided into two groups, 1) participants who received the questionnaires beforehand and completed them at the Queen Sirikit National Institute of Child Health (QSNICH), 2) participants who received and completed the questionnaires at the QSNICH on the same day. While the parents were filling out the ASQ-3, Thai version, child development progress was assessed using the Bayley-III. The length of time was recorded and compared between the two groups.

Results: The present study showed that the ASQ-3, Thai version had a sensitivity of 78.6%, 96.7%, and 83.3% among children at 12, 30 and 36 months old, respectively. The specificity was at 90.3%, 95.7%, and 98.7% among 12, 30 and 36-month-old children, respectively. The validity for 30-month-old children was very high and had almost perfect kappa agreement of 0.81 to 1, while the validity among children at 12 and 36-month-old was substantial (kappa agreement of 0.67 to 0.86).

Conclusion: The feasibility and accuracy of ASQ-3, Thai version is an applicable suitable developmental screening tool for children at 12, 30 and 36 months old in time limited circumstances and with insufficient health personnel. The validity of the ASQ-3, Thai version is acceptable when comparing to the standardized Bayley-III. The questionnaire is faster to complete than the child development progress assessment using the Bayley-III.

Keywords: ASQ-3 (Thai version), Psychometric properties, Developmental screening, Feasibility

DOI: doi.org/10.35755/jmedassocthai.2020.12.10302

Received 18 June 2019 | Revised 15 July 2020 | Accepted 18 July 2020