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Table 1 Characteristics of studies included in the meta-analysis

From: Association of CYP1A1 MspI polymorphism in the esophageal cancer risk: a meta-analysis in the Chinese population

Reference Source of controls Geographical locations Histopathology type Case number Control number Case Control HWE
       TT CT CC TT CT CC χ 2 P
Wu 2002 [16] HB Taiwan ESCC 146 344 60 65 21 136 146 62 4.16 0.041
Li 2002 [17] HB Shaxi NS 73 75 20 30 23 37 25 13 4.96 0.026
Yin 2005 [18] HB Jiangsu ESCC 106 106 42 54 10 41 49 16 0.05 0.829
Zhu 2005 [19] HB Shaxi ESCC + EAC 163 166 43 75 45 75 67 24 1.96 0.162
Han 2005 [20] HB Shaxi ESCC 89 98 25 39 25 47 38 13 1.37 0.241
Lu 2006 [21] PB Xinjiang ESCC 64 116 23 28 13 44 56 16 0.07 0.786
Yin 2010 [22] HB Xinjiang NS 96 174 16 45 35 17 88 69 2.13 0.144
Ji 2010 [23] PB Gansu ESCC 189 216 49 95 45 70 98 48 1.49 0.222
Gao 2012 [24] PB Ningxia ESCC 40 80 15 17 8 28 41 11 0.43 0.511
Huang 2012 [25] PB Guangxi ESCC 98 100 38 41 19 40 43 17 0.85 0.358
Zhang 2013 [26] PB Shandong ESCC 138 170 34 78 26 59 83 28 0.02 0.896
Yun 2014 [27] PB Henan ESCC 157 157 73 72 12 95 50 12 2.11 0.146
Zhang 2011 [28] PB Henan ESCC + EAC 160 160 97 63 128 32 -
  1. PB population-based, HB hospital-based, ESCC esophageal squamous cell carcinoma, EAC esophageal adenocarcinoma, NS not stated.