Fig. 1

Survival curves of each group. The poorest oral health group (OHAT ≥3) showed high mortality based on log rank test after making the post-hoc Bonferroni correction in the Kaplan–Meier survival curve analysis (p = 0.012, OHAT 0 group vs. OHAT ≥3 group; p = 0.010, OHAT 1–2 group vs. OHAT ≥3 group) Solid line represents OHAT ≥3 group, and short and long dashed lines represent OHAT 0 and 1–2 groups, respectively

Abbreviations: OHAT, oral health assessment tool.