[Distribution of waist circumference and waist-to-height ratio for 7-18 children and adolescents in Gansu Province].

OBJECTIVE: To understand the percentile normal of waist circumference and waist-to-height ratio for 7-18 children and adolescents in Gansu Province and to analyze their distribution and growth trend. METHODS: A stratified cluster representative sample of 6600 urban and rural children aged 7-18 years in Gansu Province was selected. To measure their waist circumference and height and establish the norm of waist circumference and waist-to-height ratio with percentile method. To compare them with the domestic correlation data. RESULTS: Sex-age specific percentiles of P5, P10, P25, P50, P75, P90, P95 of waist circumference and waist-to-height ratio for 7-18 children in Gansu Province were accessed. The P50 of waist circumference was increasing year by year and crossed two times, but that of waist-to-height ratio fluctuated slightly. A comparison of the P50 of the waist circumference and waist-to-height ratio among China, Peking and Gansu. Before 15 the data of Gansu were lower than those of China and Beiing;but were higher than that after 16. CONCLUSION: To have constructed percentile normal of waist circumference and waist-to-height ratio for 7-18 children and adolescents in Gansu Province. The study provided a basic data for further studies of child and adolescent central obesity in China.