Table 1.

Clinical Characteristics of the Early ESCC, EBL and HC Groups

Variable	Early ESCC (n = 112)			EBL (n = 107)			HC (n = 151)			P
	No.	Mean	%	No.	Mean	%	No.	Mean	%
Age (years):										>0.05
Mean		60.5			60.0			58.3
Standard deviation		9.5			11.1			8.6
Sex:										>0.05
Male	78		69.6	67		62.6	102		67.5
Female	34		30.4	40		37.4	49		32.5
Smoking history:	35		31.3	32		29.9	43		28.5	>0.05
Drinking history:	20		17.9	14		13.1	19		12.6	>0.05
Stage:
0	33		29.5
I	31		27.7
II	48		42.8
EBL:
Esophageal benign tumors				54		50.5
Benign ulcer of esophagus				8		7.5
Esophageal erosions				32		29.9
Reflux esophagitis				13		12.1