Apidechakul P.Triyasunant N.Permpolprasert L.Punchuklang W.Vichitvejpaisal P.Mahidol University2025-10-122025-10-122025-10-01Siriraj Medical Journal Vol.77 No.10 (2025) , 716-724https://repository.li.mahidol.ac.th/handle/123456789/112503Objective: To develop and validate a skills assessment tool for evaluating the workplace performance of student anesthetist nurses through a psychometric analysis of its reliability and validity. Materials and Methods: The study was conducted in three sequential phases: Scale Development: A comprehensive literature review and expert consultations were undertaken to construct the initial assessment items. Content Validation: Three expert anesthetists reviewed the draft scale for content validity. Psychometric Testing: The final scale was evaluated using data from 40 student anesthetist nurse assessments in 2023-2024. Recruitment was conducted in the gynecology surgery rooms. Results: The finalized workplace-based assessment scale consisted of 24 items spanning three key domains: patient and equipment preparation, technical skills, and non-technical skills. The psychometric analysis demonstrated strong internal consistency (Cronbach’s α = 0.93), high inter-rater reliability (The Intraclass Correlation Coefficient (ICC) = 0.87), and moderate concurrent validity, as evidenced by Pearson’s correlation analysis (r = .511, p < .05, N=40). Conclusion: The newly developed workplace-based assessment scale exhibits strong psychometric properties, providing a reliable and comprehensive tool for evaluating the clinical competencies of student anesthetist nurses in practice settings.MedicineArticleSCOPUS10.33192/smj.v77i10.2761862-s2.0-10501763280822288082