Psychometric Properties of the Language Development Test for Thai Children Aged 5 to 7 Years Old Language Development Test For Thai Children
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Abstract
The purpose of this research was to develop the Language Development Test for Thai Children aged 5 to 7 years old and to investigate the validity and reliability of the test. This research was divided into three phases: The first phase was to develop the test and to investigate its content validity by 5 experts. The second phase was to try out the test in 15 typical children. The third phase was to test construct validity using a known group method, and to test reliability using internal consistency. In this phase, the test was evaluated with children aged 5-7 years old who were divided into two groups, typical and delayed language development groups. Each group had 90 children who were separated into three age subranges: 5, 6 and 7 years old. Research results found that the test had content validity. Statistical analysis results, using Mann-Whitney U, revealed that the typical groups had significant differences from the delayed language development groups at the 0.01 level. Typical subjects had higher test scores than delayed language development subjects. The Kuder-Richardson Formula 20 testing results also indicated that there was a high level of reliability (KR-20 = 0.97-0.99). Therefore, it can be concluded that the test had psychometric properties and is suitable for evaluating language development of Thai children aged 5-7 years old
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