Patients were grouped by ages: 0-20 years, 21-40 years, 41-50 years, 51-60 years, 61-70 years, 71-80 years, 81-90 years, and 91-100 years. Mann-Whitney rank sum test was used to compare nonparametric continuous variables between patients with or without hypertension and median age subgroups. Chi-square or Fisher exact tests were used for categorical variables. Statistical tests were 2-tailed, with significance deemed as a p value of < 0.05. Anaysis was not adjusted.