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Background The purpose of the present study was to explore the association between hemoglobin (Hb) level and blood pressure among children and adolescents in Lanzhou.Methods This was a cross-sectional study of 4200 Han nationality children and adolescents(age 7-18 years,2138 boys and 2062 girls).The data of hemoglobin level and blood pressure were gathered by trained physicians in standard methods.