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To examine the interaction effect between sleep duration and dietary patterns on obesity, in order to explore the possible risk factors for preschool children's obesity. During September of 2018 to March of 2019(1148 boys and 981 girls, 1199 living in urban and 930 living in rural, 756 only child and 1373 not only child), a total of 2129 preschool children used two-stage cluster sampling method from 22 kindergartens aged 3-6 years old were investigated. Social-demographic information(included sex, age, only child or not, left-behind ch