Table 1. Patient group and demographic characteristics.

Factor	Patient (n=168)
Age(≤60/>60)	32(19.0%)/136(81.0%)
Sex (male/female)	134(79.8%)/34(20.2%)
Smoking (no/yes)	72(42.9%)/96(57.1%)
Tumour site (Upper 1/3/Middle 1/3/Lower 1/3)	60(35.7%)/78(46.4%)/30(17.9%)
T stage (II/III/IV)	24(14.3%)/106(63.1%)/38(22.6%)
N stage (0/I)	44(26.2%)/124(73.8%)
Clinic stage (II/III/IV)	44(26.2%)/86(51.2%)/38(22.6%)
Adjuvant therapies (RT/CCRT)	46(27.4%)/122(72.6%)

RT: radical radiotherapy only; CCRT: concurrent chemoradiotherapy.