Adaptation, validity, and reliability of the Preschool Language Scale-Fifth Edition (PLS-5) in the Turkish context: The Turkish Preschool Language Scale-5 (TPLS-5).

Introduction: Speech and language assessment is very important in early diagnosis of children with hearing and speech disorders. Aim of this study is to determine the validity and reliability of Preschool Language Scale (5th edition) test with its Turkish translation and adaptation.

Methods And Materials: Our study is conducted on 1320 children aged between 0-7 years 11 months. While 1044 of these children have normal hearing, language and speech development, 276 of them have receptive and/or expressive language disorder. After the English-Turkish and Turkish-English translations of PLS-5 made by two experts command of both languages, some of the test items are reorganized because of the grammatical features of Turkish and the cultural structure of the country. The pilot study was conducted with 378 children. The test which is reorganized in the light of data obtained in pilot application, is applied to children chosen randomly with layering technique from different regions of Turkey, then 15 days later the first test applied again to 120 children.

Results: While 1044 of 1320 children aged between 0 and 7 years 11 months are normal, 276 of them have receptive and/or expressive language disorder. While 98 of 103 healthy children of 120 taken under the second evaluation have normal language development, 8 of 9 who used to have language development disorder in the past still remaining (Kappa coefficient:0,468, p<0,001). Pearson correaltion coefficient for TPLS-5 standard gauge are; IA raw score:0,937, IED raw score: 0,908 and TDP: 0,887 respectively. Correlation coefficient for age equivalance is found as IA:0,871, IED: 0,896, TDP: 0,887.

Conclusions: TPLS-5 is the first and only language test in our country that can evaluate receptive and/or expressive language skills of children aged between 0-7 years 11 months. Results of the study show that TPLS-5 is a valid and reliable language test for the Turkish children.