How useful is a family history of hypertension as a predictor of future hypertension?

A hypothetical model for predicting hypertension is discussed. Assuming that being in the top quintiles of the blood pressure distribution at adolescence and/or having a family history of hypertension, the estimated risk for developing hypertension as an adult could be 37% in a population with a prevalence of hypertension on 20%. Using the blood pressure level in adolescence and/or positive family history of hypertension as a predictive "test", the sensitivity of this "test" is 65% and the specificity 73%.