FACTORS ASSOCIATED WITH PHYSICAL ACTIVITY AMONG GRADE 4-6 STUDENTS IN NORTHERN THAILAND: Archin Songthap1, Pramote Wongsawat1, Phong-Ek Suksai2, Wanitcha Kanthasorn3and Pattama Suphunnakul1. SEATROPH 2020, 50 (5), 976-983.