Sarakarn , Pongdech, Pallop Siewchaisakul, Putthikrai Pramual, Nuntiput Putthanachote, and Donlagon Jumparway. “Analysis of Covariance (ANCOVA): Optimal Method for Analyzing Pre-post Data with Repeated Measures Two Groups under Experimental Design in Health Science Research”. Health Science Journal of Thailand 6, no. 1 (January 24, 2024): 42–51. accessed September 20, 2026. https://he02.tci-thaijo.org/index.php/HSJT/article/view/262258.