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Blood pressure of 3,833 school children aged 6 to 14 years has been measured in April to June 1989 at Wonju county, Kangwon, Korea. The objectives of this study were to identify the distribution of blood pressure in school children, and the factors related to that. The mean blood pressure increased by age in both sexes but are higher in female. Systolic blood pressure was highest in blood group O and lowest in blood group B. Blood pressures were correlated positively with age, Quetelet index, Kaup index, height, weight, sitting height, arm circumference, triceps skinfold thickness, air temperature, altitude, pulse rate, serum total protein, albumin, globulin, uric aicd, glucose, and triglyceride, and negatively with LDL-cholesterol. Most of the correlation coefficients were higher with systolic blood pressure than with diastolic blood pressure. In multiple regression analysis, 43.6% of the variation in systolic blood pressure was explained with weight, pulse rate, age, arm circumference, height, and triceps skinfold thickness and 32.3% of that in diastolic blood pressure was explained with weight, age, pulse rate, and triceps skinfold thickness.