Resultsĭuring the median 12.23 years of follow-up period, 52.8% ( n= 11,168) and 23.6% ( n=5004) of the participants had stage 1 and stage 2 hypertension, respectively. ![]() We classified the participants into four courses (Course A: normal BP → elevated BP → stage 1 hypertension→ stage 2 hypertension, Course B: normal BP → elevated BP → stage 2 hypertension, Course C: normal BP → stage 1 hypertension → stage 2 hypertension, Course D: normal BP → stage 2 hypertension) according to their progression from normal blood pressure to stage 2 hypertension. ![]() The criteria for blood pressure were based on the American College of Cardiology/American Heart Association 2017 guideline (normal BP: SBP < 120 and DBP < 80 mmHg, elevated BP: SBP 120–129 and DBP < 80 mmHg, stage 1 hypertension: SBP 130–139 or DBP 80–89 mmHg, stage 2 hypertension: SBP ≥140 or DBP ≥ 90 mmHg). We selected a total of 21,172 normotensive individuals between 20 from the National Health Insurance Service-Health Screening and followed them up until 2015. The study aimed to estimate the incidence of and period of progression to stage 2 hypertension from normal blood pressure.
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