Word-level Speech Intelligibility, Percentage of Consonants and Vowels Correct Indonesian Children Using Preschool Sound Production Test

Background: Instruments and normative data of children's speech intelligibility in Indonesian are still a challenge and obstacle for speech therapists in Indonesia to objectively identify whether children's speech intelligibility is age-appropriate or not. This study aims to identify normative data of word-level speech intelligibility, percentage of consonants correct (PCC), and percentage of vowels correct (PVC) in Indonesian children using the Preschool Sound Production Test (Tes Produksi Bunyi Bicara Prasekolah). Method: This study is a descriptive quantitative study. This study involved 365 typical children aged four to five years. The first language and the language used by the samples for daily communication is Indonesian. The study was conducted from September to October 2024. Each child was tested individually using the Preschool Sound Production Test (Tes Produksi Bunyi Bicara Prasekolah). Result: Based on the results of data analysis, it was found that word-level speech intelligibility (F = 73.7; p < .001), percentage of consonants correct (F = 29.1; p < .001), and percentage of vowels correct (F = 20.7; p < .001) of four-year-old children were different from those of five and six years old. Conclusion: The Preschool Sound Production Test (Tes Produksi Bunyi Bicara Prasekolah) has been shown to have construct validity and can be used to identify typical and atypical speech intelligibility.