Blood pressure in Danish children and adolescents.

The children had been randomly selected and serve as an urban reference population. Blood pressure was measured in 52 different schools, with the same Random-Zero-Sphygmomanometer, and all pressures were measured by the same person, under standardized conditions, to eliminate as many sources of error and uncertainties as possible. For both sexes an age-dependent significant increase in both systolic and diastolic blood pressure was observed. For both the systolic and the diastolic pressures, significant differences in blood pressure measured before and after blood testing were observed.