KMAN Publication Inc. International Journal of Sport Studies for Health 2588-5782 9 Serial Number 25 2026 02 09 Development and validation of a self-efficacy instrument for university students in swimming lesson Development and validation of a self-efficacy instrument for university students in swimming lesson 1 13 10.61838/kman.intjssh.4823 EN Journal Article 2025 11 29 Objective: This study aims to develop a self-efficacy measurement instrument for university students in swimming lessons based on Bandura's (1977) Self-Efficacy theory. The instrument was developed through 4 main dimensions, namely (1) D1 performance accomplishment, (2) D2 vicarious learning, (3) D3 verbal encouragement, and (4) D4 emotional states. Methods: The development stages began with the preparation of instrument grids based on literature studies, content validity testing by experts, trial I with 203 students using exploratory factor analysis (EFA), and trial II with 323 students using confirmatory factor analysis (CFA). Measurements were taken with Google Forms while students were attending swimming lessons. Results: The results showed that trial I, data feasibility testing, gave Kaiser-Meyer-Olkin (KMO) value of 0.946 and a significant Bartlett's Test (χ² = 5328; p < 0.001). This indicated that the data were suitable for factor analysis. EFA produced 4 main factors that explained 62% of the total variance, with factor loadings of 0.343 to 0.828. A total of 31 items had a uniqueness value below 0.5, while 1 item was >0.8, leading to its removal. After the removal, a final instrument consisting of 31 statement items spread across the 4 dimensions was obtained. Test II, which examined the feasibility of the first-order CFA model, demonstrated acceptable model fit. The results indicated χ² = 990, df = 430, p < .001, with a χ²/df ratio of 2.302. Additional fit indices further supported the model’s adequacy, namely Root Mean Square Error of Approximation (RMSEA) = 0.064 (90% CI: 0.058–0.069, p < .001), Standardized Root Mean Square Residual (SRMR) = 0.045, Comparative Fit Index (CFI) = 0.997, and Tucker–Lewis Index (TLI) = 0.997. All items in the 4 dimensions were declared valid, as evidenced by factor loading values of 0.688-0.966 and Average Variance Extracted (AVE) of 0.595-0.901. McDonald's omega ω₁-₃ values ranged from 0.882 to 0.939, and Cronbach's α ranged from 0.876 to 0.945. In the second order, the 4 dimensions were declared valid with loading factors of 0.93-0.97, AVE of 0.901, reliability ω₁-₃ of 0.926-0.935, and Cronbach's α of 0.945. Conclusion: The developed self-efficacy instrument for swimming students proved to be psychometrically valid and reliable, making it suitable for use in identifying students' psychological readiness in swimming lessons

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