Abstract: Objective: To explore the optimal cutoff values of blood pressure-to-height ratio (BPHR) for screening the hypertension of the adolescents,and to provide the basis for understanding the prevalence of hypertension in the adolescents in Yanji city of Jilin province. Methods: From September to October 2016,a total of 23 middle schools and high schools in Yanji city of Jilin province were selected,and a total of 18 244 adolescents (9 567 boys and 8 677 girls) aged from 12 to 17 years old in Yanji city of Jilin province were enrolled by means of whole population sampling.The blood pressure (BP),heights and body weights of the adolescents were measured,and the systolic BP-to-height ratio (SBPHR) and diastolic BP-to-height ratio (DBPHR) were calculated.Receiver operating characteristic (ROC) curve analysis was performed to determine the optimal cutoff values and evaluate the sensitivity,specificity,negative predictive value (NPV) and positive predictive value (PPV). Results: The prevalence of hypertension in the Korean and Han adolescents aged 12-17 years old were 12.8% and 13.0% for boys and 5.9% and 6.2% for girls,respectively; there was no significant difference in the prevalence of hypertension between different genders in two nationalities (χ²=0.091,P> 0.05;χ²=0.295,P> 0.05).The total prevalence of hypertension was 12.9% for boys and 6.1% for girls,the difference was statistically significant (χ²=242.072,P<0.01). The prevalence of hypertension of the boys at the age of 15 years old reached its peak and the curve of hypertension prevalence changed with age showed as a sudden increasing and sudden decreasing trend;the changes of prevalence of hypertension with age were little in the girls.The prevalence of hypertension in the boys aged 12 to 17 years old was significantly higher than that in the girls (P<0.05).The correlation between age and SBPHR in the boys was negative (r=-0.085,P<0.01),and there was no correlation between age and SBPHR in the girls(r=0.018,P>0.05).The correlation between age and DBPHR in the boys aged 12-17 years old was negative (r=-0.080,P<0.01),and there was no correlation in the girls(r=-0.017, P>0.05);all the correlation coefficients were less than 0.1,so it was judged that there was no significant correlation between age and BPHR.The threshold values of SBP screened by SBPHR were 0.73 mmHg·cm^-1 in the boys aged 12-17 years old (sensitivity:92.2%,specificity:88.9%,PPV:52.6%,NPV:98.8%) and 0.75 mmHg·cm^-1 in the girls(sensitivity:95.6%,specificity:89.5%,PPV:33.6%,NPV:99.6%),respectively. The threshold values of DBP screened by DBPHR were 0.49 mmHg·cm^-1 in the boys aged 12-17 years old (sensitivity:91.6%,specificity:93.9%,PPV:35.3%,NPV:99.6%) and 0.51 mmHg·cm^-1 in the girls (sensitivity:89.8%,specificity:94.3%,PPV:26.7%,NPV:99.8%),respectively. Conclusion: The prevalence of hypertension in the adolescents aged 12-17 years old in Yanji city of Jilin province is lower than the national average value,and BPHR can be used as an index to screen the hypertension of the adolescents aged 12-17 years old in Yanji city of Jilin province.

Key words: receiver operating characteristic curve, hypertension, adolescent, height