Sarakarn , Pongdech, Pallop Siewchaisakul, Putthikrai Pramual, Nuntiput Putthanachote, and Donlagon Jumparway. 2024. “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 (1):42-51. https://doi.org/10.55164/hsjt.v6i1.262258.