Liu 2019b.

Study name	The DECIDE‐Children study
Methods	Study design: cluster‐RCT
Participants	School type: primary schools; grade 4 (aged 8–10 years) students Region: China (Beijing, Shanxi, and Xinjiang)
Interventions	Number of experimental conditions: 2 intervention and control Policies, practices or programmes targeted by the intervention The DECIDE‐Children study aims to develop a school‐based, multi‐faceted childhood obesity prevention programme targeting school children aged 8–10 years in 3 different regions of China and rigorously test its effectiveness in preventing excessive weight gain in Chinese primary school settings. Implementation strategies EPOC: audit and feedback ‐ Review of phone app data with follow‐ups for those not complying with protocol. EPOC: educational materials ‐ Smartphone app. EPOC: educational meetings ‐ Health education activities for school staff.
Outcomes	Outcome relating to the implementation of childcare service policies, practices or programmes School policies related to obesity prevention and management, which will be collected by the questionnaires in both the intervention and the control groups.
Starting date	September 2018
Contact information	Hai‐Jun Wang, Peking University
Notes	Trial registration: NCT03665857