Table 3.

Dental calculus indices of the 1676 subjects who survived or died from heart infarction during the years 1996–2009.

Year	Alive (n)	Dead (n)	Dental calculus index among the surviving	Dental calculus index among the deceased	P value
1996	1653	18	0.46 ± (0.58 SD)	0.61 ± (0.61 SD)	NS
1998	1647	24	0.46 ± (0.58 SD)	0.61 ± (0.76 SD)	NS
2000	1642	29	0.46 ± (0.58 SD)	0.64 ± (0.75 SD)	NS
2001	1631	40	0.46 ± (0.58 SD)	0.65 ± (0.73 SD)	<0.05
2009	1598	73	0.45 ± (0.57 SD)	0.67 ± (0.76 SD)	<0.01

Data expressed as mean and ± SD.