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Blood pressure increases with age in normal children. This increase appears to be related to body size. To assess the role of body size as a determinant of blood pressure in precocious puberty, we compared the blood pressure of 81 children with precocious puberty with the blood pressure standards for normal children from the NHLBI Task Force on Blood Pressure Control in Children. Children with precocious puberty had significantly increased blood pressure for chronologic age (p less than 0.05) but generally appropriate blood pressure for height age or weight age. These data are consistent with the hypothesis that increased body size causes the increased blood pressure for chronologic age in children with precocious puberty. Physicians who evaluate such children should assess whether blood pressure is appropriate for height age rather than chronologic age.