From November to December 2019, a cross-sectional study including 1 243 children aged 8~13 years was conducted in one primary school in Huantai County, and 1 238 children with complete data were finally included. A total of 1 238, 146, and 83 children were included in the first, second and third visit of the follow-up, respectively. With the follow-up visits increasing, the systolic blood pressure (SBP) and diastolic blood pressure (DBP) levels of the 83 children who were followed up across all three different visits decreased significantly across three different visits (both Pfor trend<0.05). The prevalence of elevated blood pressure across the three visits was 11.8%, 6.8% and 4.0% (Pfor trend<0.001); the prevalence of elevated SBP was 11.4%, 6.5%, and 4.0% (Pfor trend<0.001); the prevalence of elevated DBP was 1.1%, 1.0%, and 0.4%, respectively (Pfor trend>0.05).
于2019年11-12月在桓台县某所小学选取1 243名8~13岁儿童进行横断面调查，所有变量完整者共1 238名。随访第一、二、三时点分别纳入1 238、146、83名研究对象；随着随访次数的增加，三时点均受访的83名研究对象的收缩压和舒张压水平均明显降低（P趋势值均<0.05）；三个时点血压偏高检出率分别为11.8%、6.8%和4.0%（P趋势值<0.001），其中收缩压偏高检出率分别为11.4%、6.5%和4.0%（P趋势值<0.001），而舒张压偏高检出率分别为1.1%、1.0%和0.4%（P趋势值>0.05）。.
Keywords: Blood pressure; Child; Hypertension; Repeated measurement.