2.1. Study Design and Setting
COA No., malnutrition
MAY, MALNUTRITION
This cluster randomized controlled trial with parallel design was conducted at six rural primary schools in Nakhon Pathom (Central), Chachoengsao, Chon Buri (Eastern), and Ratchaburi (Western) in Thailand from May 2019 to March 2020. This study was aimed at rural schools where the prevalence of malnutrition was still problematic. The school locations were considered rural areas due to the low population density and no franchise convenience stores within a 10-kilometer radius. We chose rural schools where >10% of all students were underweight based on the weight-for-age (W/A) measurements. The study protocol was approved by the Institutional Review Board of Siriraj Hospital, Mahidol University (COA No. Si 322/2017). Written informed consent was obtained from the parents or legal guardians of the participating children prior to starting the study. This clinical trial was registered with 