[Research on the prevalence of overweight and obesity among children].

<b>Objective:</b> To investigate the prevalence and risk factors of overweight and obesity among Chinese children aged 3-18 years from 11 provinces, antonomous regions, or municipalities. <b>Methods:</b> This national cross-sectional community health survey utilized a multistage stratified cluster-random sampling method to recruit 193 997 nationally representative participants from 11 provinces, autonomous regions, or municipalities between January 2017 and December 2019. All participants underwent physical examinations, and their caregivers completed questionnaires assessing participants' dietary, lifestyle, familial, and perinatal information. Multilevel multinomial logistic regression models were employed to identify the potential risk factors. <b>Results:</b> The cohort comprised 193 997 children (102 178 boys, 91 819 girls),aged (10±4) years. Overall prevalence rates were 30 574(15.8%)overweight children and 17 217(8.9%) obesity children. Boys exhibited higher overweight and obesity rates than girls (17.0% (17 368/102 178) <i>vs.</i> 14.4% (13 206/102 178), 11.3% (11 553/91 819) <i>vs.</i> 6.2% (5 664/91 819), <i>χ</i>²=249.12,1 578.69,both <i>P</i><0.001). The detection rates of obesity in Tanner stage 2 and 3 were the highest in boys and girls, with 13.4%(2 231/16 665) and 8.6%(880/10 221) respectively. Risk factors for obesity included parental overweight (paternal <i>OR</i>=2.34 and maternal <i>OR</i>=2.29), annual household income of 100 000-200 000 yuan (compared with<100 000 yuan, <i>OR</i>=1.04), higher paternal education (compared with below high school,high school and a college education <i>OR</i>=1.09,1.14), birth weight >4.0 kg (≤5 and>5 years old <i>OR</i>=1.74, 1.44,respectively), and western food consumption≥1 time/month (compared with<1, 1-2, 3-4,>4 times/month <i>OR</i>=1.36, 1.30, 1.67(≤5 years), 1.19, 1.16, 1.15 (>5 years), respectively) (all <i>P</i><0.05). Conversely, coarse grain intake≥1 times/week (compared with<1 times/week, every day, 3-4, 1-2 times/week <i>OR</i>=0.74, 0.80, 0.71 (≤5 years), 0.75, 0.87, 0.90(>5 years), respectively, all <i>P</i><0.05) was associated with reduced obesity risk. <b>Conclusions:</b> Obesity epidemiology in children demonstrates significant heterogeneity across age, gender, geographic regions, and pubertal stages. It is necessary to establish a personalized prevention and control strategy.