Minho Suture Assessment Scale – Development and Validation of a scale using Item Response Theory

Abstract

Purpose: This study introduces and validates the Minho Suture Assessment Scale (Minho-SAS), a detailed instrument designed to evaluate fundamental suturing competencies among medical students. Through the application of Item Response Theory (IRT) and a dichotomous yes/no response format, the scale aims to offer a comprehensive yet specific assessment framework for suturing abilities. Methods: The development process involved collaboration with multidisciplinary surgical teams and experienced practitioners to ensure content validity. Validation methods incorporated IRT techniques, employing the Rasch model and the 2-PL model, to assess reliability, construct validity, and measurement precision. Data from a cohort of medical students were utilized for rigorous psychometric evaluation. Results: The Minho-SAS demonstrated strong internal consistency, reliability, and construct validity across both Rasch and 2-PL models. Item analyses revealed a nuanced understanding of individual item performance, highlighting varying levels of difficulty and discrimination among the 15 assessment components. The scale's focus on fundamental suturing skills was evident in its detailed evaluation, contrasting with broader assessment tools. Conclusion: The Minho-SAS emerged as a promising instrument specifically tailored for assessing fundamental suturing skills among medical students. Its rigorous validation through IRT methodologies underscored its precision and reliability, distinguishing it as a valuable addition to existing evaluation scales. While demonstrating considerable promise, further exploration across diverse populations and educational settings is crucial to affirm its broader applicability and impact in medical education and clinical practice.