Demographic and clinical characteristics
Between November 2020 and June 2021, 528 children and their parents were screened for this study. Of them, 443 did not meet the inclusion criteria, one declined to participate, and 84 were enrolled, with 42 in each group. Of the 84 included children, the operation was postponed beyond the study period in four children due to personal reasons, intervention failed in the other two children, and the remaining 78 (40 in the control group and 38 in the intervention group) were available for analysis. The flow chart of the study in terms of patient enrollment, allocation, follow-up observation, and analysis is shown in Fig. 
Flow diagram of the patients
Baseline characteristics of the children and their parentsNote: Age, height, weight, body mass index, and the time interval between education and admission were tested and validated to follow a normal distribution.Data was presented as the mean ± SD for continuous variables, and n (%) for categorical variables. P value calculation: Continuous variables were tested by two independent samples t-tests, and categorical variables were tested by chi-square tests