Table 3.

The univariate overall survival

Variable	N	%Alive	3-Yr Survival Rate (95%CI)	5-Yr Survival Rate (95%CI)	Hazard Ratio	p-value
All	1411	92.90%	93.5%(91.5~95.1%)	87.4%(84.3~89.9%)
1988 Stage I (N=1307)
IA	570	96.80%	97.7%(95.1~99%)	92.4%(86.8~95.7%)	Ref. Level	<0.001
IB	593	90.70%	92.4%(89.1~94.7%)	87.3%(82.9~90.6%)	2.21(1.3~3.76)
IC	144	87.50%	88.4%(78.8~93.9%)	75.7%(62.8~84.7%)	3.54(1.84~6.82)
2009 Stage I (N=1411)
IA	1249	93.70%	94.5%(92.5~96%)	89.2%(86.1~91.7%)	Ref. Level	0.001
IB	162	87%	86.8%(77.7~92.4%)	75.1%(63.1~83.7%)	2.19(1.35~3.56)
For 1988 IIA cohort (N=40)*
2009 IA	29	96.60%	93.3%(61.3~99%)	93.3%(61.3~99%)
2009 IB	11	81.80%	66.7%(16~91.4%)	66.7%(16~91.4%)
For 1988 IIIA cohort (N=105)**
2009 IA	57	91.20%	89.7%(64~97.4%)	75.3%(45.3~90.3%)
2009 IB	7	85.70%	75%(12.8~96.1%)	75%(12.8~96.1%)
2009>=II	41	82.90%	89.2%(73.6~95.8%)	74.4%(52~87.5%)

^*The results show if there is any heterogeneity among 1988 IIA cohort stratified by 2009 criteria

^**The results show if there is any heterogeneity among 1988 IIIA cohort stratified by 2009 criteria