Table 1: Characteristics of the case-control studies included in meta-analysis.

First author/referenceYearCountryEthnicityAge groupAtopic statusCase ( )Control ( )Quality scoreGenotyping method

Hákonarson [11]2001IcelandCaucasianMixedAtopic949410PCR
Liu [20]2004ChinaAsianAdultNA1001004PCR-RFLP
Donfack 1 [12]2005USACaucasianNAMixed1262059LAS
Donfack 2 [12]2005USAAfrican AmericanNAMixed2051839LAS
Battle [21]2007USAAfrican AmericanMixedNA26417611PCR-RFLP
Daley [22]2009AustraliaCaucasianMixedNA6447519Illumina Bead Array System
Wu [23]2010ChinaAsianChildrenNA2522276PCR-RFLP
Moffatt [13]2010MixedCaucasianMixedNA103651611012Illumina Human610 quad array
Li [14]2010USACaucasianAdultNA473189212Illumina HumanCNV370 BeadChip
Noguchi [24]2011JapanAsianChildrenMixed938237612 Illumina HumanHap550v3/610-Quad Genotyping BeadChip
Yoon 1 [25]2012KoreaAsianAdultNA19386459Affymetrix Genome-Wide Human SNP array 5.0
Yoon 2 [25]2012KoreaAsianAdultNA4474509Affymetrix Genome-Wide Human SNP array 5.0

PCR: polymerase chain reaction; RFLP: restriction fragment length polymorphism; LAS: multiplex PCR and an immobilized linear array system; NA: not available.