## 3 Statistical Analysis  
The data were statistically analyzed using SPSS (version 18.0, IBM, Armonk, NY, USA). The distributions of characteristics were converted into percentages (%), and the successive data were presented as averages and standard deviations (M \(\pm\) SD). The distribution and average difference in general characteristics according to the non-HTN and HTN groups were calculated using chi-square and \(t\)-tests (Table 1). The distribution and average difference in clinical characteristics according to periodontitis in non-HTN and HTN groups were calculated using chi-square and _t_-tests (Table 2). A multiple linear regression analysis model was constructed for CPI after adjusting for gender, age, regular exercising, drinking, smoking, BMI, WC, TC, HDL-C, TGs, FBG, hs-CRP, and PP (Table 3). When an analysis of covariance test was performed for CPI scores, the four models constructed were: (1) adjusted for gender and age; (2) further adjusted for smoking, regular exercise, and drinking; (3) Model 2 further adjusted for BMI and WC; and (4) Model 3 further adjusted for TGs, HDL-C, TC, hs-CRP, and FBG (Table 4). When a logistic regression was performed for the OR of periodontitis, the four models constructed were: (1) non-adjusted; (2) adjusted for gender and age; (3) further adjusted for smoking, regular exercise, and drinking; and (4) further adjusted for BMI, WC, HDL-C, TGs, TC, hs-CRP, and FBG (Table 5). The significance level for all statistical data was set at \(p\) < 0.05.  
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Gender**} & \multirow{2}{*}{**Category**} & \multicolumn{8}{c}{**Community Periodontal Index (CPI) Scores**} \\ \cline{3-13}  & & \multicolumn{3}{c}{**Model 1**} & \multicolumn{3}{c}{**Model 2**} & \multicolumn{3}{c}{**Model 3**} & \multicolumn{3}{c}{**Model 4**} \\ \cline{3-13}  & Normal PP & 4.05 \(\pm\) 0.09 (3.88-4.22) & 4.05 \(\pm\) 0.09 (3.88-4.22) & 4.05 \(\pm\) 0.09 (3.88-4.22) & 4.05 \(\pm\) 0.09 (3.88-4.22) & 4.05 \(\pm\) 0.09 (3.88-4.23) \\  & High PP & 5.64 \(\pm\) 0.27 (5.12-6.17) & 5.64 \(\pm\) 0.27 (5.12-6.17) & 5.63 \(\pm\) 0.27 (5.10-6.15) & 5.61 \(\pm\) 0.27 (5.09-6.14) & & & & & \\  & \(p\) & \(<\)0.001 & \(<\)0.001 & \(<\)0.001 & \(<\)0.001 & \(<\)0.001 & \\ \hline Non-HTN (\(n=2415\)) & Normal PP & 3.84 \(\pm\) 0.10 (3.65–4.02) & 3.84 \(\pm\) 0.10 (3.65–4.02) & 3.84 \(\pm\) 0.10 (3.65–4.02) & 3.84 \(\pm\) 0.10 (3.65–4.02) & 3.84 \(\pm\) 0.10 (3.65–4.03) & 3.84 \(\pm\) 0.56 (2.75–4.93) \\  & High PP & 3.95 \(\pm\) 0.55 (2.87–5.04) & 3.95 \(\pm\) 0.55 (2.86–5.03) & 3.89 \(\pm\) 0.55 (2.81–4.98) & 3.84 \(\pm\) 0.56 (2.75–4.93) \\  & \(p\) & 0.835 & 0.842 & 0.919 & 0.999 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Comparisons of the community periodontal index scores and pulse pressure in overall, non-HTN, and HTN groups.  
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Variables**} & \multicolumn{3}{c}{**Overall (\(n=3496\))**} & \multicolumn{3}{c}{**Non-HTN (\(n=2415\))**} & \multicolumn{3}{c}{**HTN (\(n=1081\))**} \\ \cline{2-10}  & \multicolumn{2}{c}{**Non-Periodontal Disease (\(n=2989\))**} & \multirow{2}{*}{\(p\)**Periodontal (\(n=998\))**} & \multirow{2}{*}{\(p\)**Periodontal (\(n=792\))**} & \multirow{2}{*}{\(p\)**Periodontal (\(n=623\))**} & \multirow{2}{*}{\(p\)**Periodontal (\(n=706\))**} & \multirow{2}{*}{\(p\)**Dissesese (\(n=757\))**} & \multirow{2}{*}{\(p\)**Dissesese (\(n=706\))**} \\  & & & & & & & & & & \\ \hline CPI & 1.88 \(\pm\) 2.39 & 10.08 \(\pm\) 4.68 & \(<\)0.001 & 1.80 \(\pm\) 2.36 & 9.71 \(\pm\) 4.53 & \(<\)0.001 & 2.09 \(\pm\) 2.45 & 10.70 \(\pm\) 4.87 & \(<\)0.001 \\ Age (years) & 50.84 \(\pm\) 15.92 & 53.04 \(\pm\) 4.68 & \(<\)0