Table 2.

Survival time and incidence density

Variables		Mean of survival time	SE	Incidence (%)	χ2	P
Sex	Male	4.73	0.05	8.73	386.2	< 0.001
	Female	5.43	0.02	2.25
Age	≤65 group	5.09	0.03	5.57	6.42	0.011
	> 65 group	4.78	0.05	7.24