 If a BP measurement prior to registration is greater than 95th percentile for age and height, it must be rechecked and documented to be less than 95th percentile for age and height prior to registration. If a patient falls between the height or weight percentiles, site should average the value as appropriate. For patients greater than or equal to 18 years, use adult normal ranges for blood pressure. Patients with hypertension are eligible if their blood pressures become less than 95th percentile after anti hypertensive medications. 