Fig. 1
From: Association of changes in frailty with mortality in the aged with hypertension

Study flow chart. Note: Except for the missing data, some potential abnormal blood pressure values were defined as missingness, including SBP < 80 or > 300 mm Hg, DBP < 40 or > 200 mm Hg, and SBP minus DBP < 10 or > 200 mm Hg. Abbreviations: SBP: systolic blood pressure; DBP: diastolic blood pressure.