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Table 1 Characteristics of the studies included in the meta-analysis

From: Heterogeneity revealed through meta-analysis might link geographical differences with nasopharyngeal carcinoma incidence in Han Chinese populations

   Stage I         Stage II       
  Sample Genotyping   Sample Gender (%)a Ageb Genotyping Sample Gender (%)a Ageb
Study Population Method SNPs Case Control Case Control Case Control Method Case Control Case Control Case Control
Tse (2009)  Taiwan Illumina Hap550 480,365 277 285 76 67 49 (12) 50 (14) TaqMan 635 1,640 73 73 50 (13) 59 (14)
Bei (2010) Guangdongc Illumina Hap610 464,328 1,583 1,894 73 69 46 (11) 47 (11) TaqMan 3,507 3,063 74 67 46 (12) 44 (12)
Tang (2012) Guangxi and Guangdong Affymatrix 6.0 591,458 567 476 - - - - TaqMan 923 1,105 - - - -
Li (2011) Guangdong TaqMan 233 360 360 72 34 46 (11) 41 (9)        
Zhao (2012) Guangdong SNPstream 100 206 180 71 67 - - Sequenome 535 525 73 76 - -
Hsu (2012) Taiwan TaqMan 12 337 286 70 70 46 46        
Gao (2014) Guangdong and Guangxi TaqMan 16 350 619 67 43 45 (11) 46 (10) TaqMan 816 1721 73 61 45 (11) 46 (12)
  1. aGender: Male percentage. bAge: mean and standard deviation. cMost of the samples were from Guangdong, except 922 GWAS controls were Han Chinese from Singapore