Evaluation of a BP measurement in a child first requires determination of the child's height percentile, and then comparing the child's BP level to the childhood BP tables according to the sex, age, and height percentile. Because the normal range of BP shifts with normal growth and development, the BP levels that denote high BP will change accordingly. By widespread convention, the 95th BP percentile of a reference population defines hypertension and the 90th BP percentile defines high-normal BP.
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