Fig. 2. Prevalence trends of less-than-normotensive BP or less-than-hypertensive BP according to KNHANES phase. (A) The prevalence of less-than-normotensive BP. (B) The prevalence of less-than-hypertensive BP. p for trend was determined by linear regression analysis with weighting of survey design. Less-than-normotensive BP, SBP <120 mm Hg and DBP <80 mm Hg; less-than-hypertensive BP, SBP <140 mm Hg and DBP <90 mm Hg. KNHANES, Korean National Health and Nutrition Examination Survey; BP, blood pressure; SBP, systolic blood pressure; DBP, diastolic blood pressure.