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Table 3 Characteristics of the studies evaluating effects of the GSTM1-GSTT1 dual-null genotype on bladder carcinogen risk

From: Association of Glutathione S-transferase gene polymorphism with bladder Cancer susceptibility

Author, Year Country Ethnicity Source of controls Quality score Case Control
null-null non-null-null total null-null non-null-null total
Abdel-Rahman 1998 Egypt African Hospital-based 8 14 23 37 3 31 34
Steinhoff 2000 Germany Caucasian Hospital-based 7 12 123 135 4 123 127
Schnakenberg 2000 Germany Caucasian Population-based 6 12 145 157 31 192 223
Ma 2002 China Asian Population-based 8 16 45 61 54 128 182
Lee 2002 Korea Asian Hospital-based 8 83 149 232 37 128 165
Srivastava 2004 India Asian Hospital-based 7 16 90 106 9 173 182
Moore 2004 USA Mix Population-based 8 9 97 106 6 103 109
Hung 2004 France Caucasian Hospital-based 7 28 173 201 19 195 214
Srivastava 2005 India Asian Population-based 10 17 89 106 32 338 370
McGrath 2006 USA Mix Population-based 11 18 173 191 78 844 922
Song 2009 China Asian Hospital-based 11 77 131 208 50 162 212
Salinas-Sonchez 2011 Spain Caucasian Hospital-based 5 20 131 151 6 88 94
Ovsiannikov 2012 Germany Caucasian Hospital-based 6 17 179 196 29 206 235
Henriquez-Hernondez 2012 Spain Caucasian Hospital-based 8 17 73 90 8 73 81
Berber 2013 Turkey Caucasian Hospital-based 7 11 103 114 7 107 114
Safarinejad 2013 Iran Asian Hospital-based 10 38 128 166 73 259 332
Ceylan 2015 Turkey Caucasian Hospital-based 8 8 57 65 8 62 70
Elhawary 2017 Saudi Arabia Asian Hospital-based 7 0 104 104 0 208 208