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The overlap between subjects with prehypertension, masked hypertension, and isolated nocturnal hypertension. Among those with isolated nocturnal hypertension, 174 (92.6%) have masked hypertension. Among individuals within the prehypertension range of office blood pressure, 99 (34.5%) have both isolated nocturnal hypertension and masked hypertension, and 190 (66.2%) have masked hypertension. The numbers indicate the number of cases in each group.
