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Table 1 Demographic characteristics and possible risk variables of the study subjects*

From: Relationship between the expression of hTERT and EYA4 mRNA in peripheral blood mononuclear cells with the progressive stages of carcinogenesis of the esophagus

Variables Control s
(n = 50)
BCH
(n = 50)
ESCD
(n = 50)
ESCC
(n = 50)
Gender, n(%)     
male 35(70.0) 35(70.0) 30(60.0) 30(60.0)
female 15(30.0) 15(30.0) 20(40.0) 20(40.0)
age(years), n(%)     
40~50 19(38.0) 19(38.0) 8(16.0) 7(14.0)
51~60 18(36.0) 18(36.0) 25(50.0) 23(46.0)
61~70 13(26.0) 13(26.0) 17(34.0) 20(40.0)
Smoking index, n(%)     
Never 24(48.0) 24(48.0) 25(50.0) 24(48.0)
1~600 13(26.0) 13(26.0) 14(28.0) 14(28.0)
≥ 600 13(26.0) 13(26.0) 11(22.0) 12(24.0)
Drinking index, n(%)     
Never 19(38.0) 19(38.0) 26(52.0) 25(50.0)
< 100 15(30.0) 15(30.0) 14(28.0) 8(16.0)
≥ 100 16(32.0) 16(32.0) 10(20.0) 17(34.0)
Family history of esophageal cancer, n(%)
No 39(78.0) 39(78.0) 43(86.0) 44(88.0)
yes 11(22.0) 11(22.0) 7(14.0) 6(12.0)
Education:     
Illiterate or primary school 9(18.0) 8(16.0) 25(50.0) 37(74.0)
Junior high school and over 41(82.0) 42(84.0) 25(50.0) 13(26.0)
per capita annual income($)     
< 300 6(12.0) 2(4.0) 12(24.0) 19(38.0)
300- 16(32.0) 15(30.0) 8(16.0) 22(44.0)
≥ 600 28(56.0) 33(66.0) 30(60.0) 9(18.0)
  1. *:There are significant differences of age, alcohol drinking index, education and per capita annual income among the four groups, and the values of Chi-square test are 29.044(P < 0.001), 13.974(P = 0.03), 48.436(P < 0.001) and 38.973(P < 0.001), respectively. Smoking index = cigarette/day × number of smoking years. Alcohol drinking index = ((white spirits(g) × 0.38+ wine (g) × 0.12+ beer(g) × 0.04)/month ×12)/365 day. BCH, Basal cell hyperplasia; ESCD, esophageal squamous cells dyspalsia; ESCC, esophageal squamous cells cancer.