Table 2 Hazard ratios of variables and mortality at baseline by multivariate Cox proportional hazards model

 healthy periodontium

reference

reference

 periodontitis

1.077*

1.027–1.130

1.036

0.952–1.128

Age

1.120*

1.117–1.124

1.078*

1.072–1.085

 married living together

0.812*

0.772–0.853

0.965

0.881–1.058

 other

reference

reference

 illiterate

reference

reference

 education 1–6 years

0.787*

0.724–0.856

0.920

0.781–1.083

 education 7–14 years

0.613*

0.564–0.666

0.763*

0.648–0.897

 education above 14 years

0.527*

0.480–0.579

0.626*

0.523–0.750

 female

reference

reference

 male

1.696*

1.606–1.791

1.719*

1.562–1.893

 no

reference

reference

 occasionally

1.576*

1.448–1.715

1.897*

1.653–2.177

 daily

1.253*

1.126–1.394

1.655*

1.404–1.951