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Table 2 Characteristics of eligible studies

From: XPC Lys939Gln polymorphism contributes to colorectal cancer susceptibility: evidence from a meta-analysis

First author (year)

Country

Ethnicity

Sample size (case/control)

Genotyping methods

CRC confirmation

Source of control

Matching criteria

Quality scores

HWE(P value)

Pardini 2008

Czech

Caucasian

532/532

PCR-RFLP

HC

HB

Age and sex

8

0.165

Gil 2012

Poland

Caucasian

133/100

PCR-RFLP

NR

HB

Region

3.5

0.803

Yue 2013

China

Asian

428/450

PCR-RFLP

PC

HB

Age and sex

6

0.964

Aizat 2013

Malaysia

Asian

255/255

PCR-RFLP

HC

HB

NR

5

0.316

Engin 2010

Turkey

Caucasian

110/116

PCR-RFLP

NR

HB

NR

5

0.642

Wu 2011

China

Asian

420/842

PCR-RFLP

HC

PB

Age, sex, smoking and BMI

9

0.639

Liu 2012

China

Asian

1028/1085

PCR-RFLP

HC

HB

Age and sex

8

0.740

Hansen 2007

Denmark

Caucasian

395/797

Endpoint reading

NR

PB

Sex

7.5

0.112

  1. HC, Histologically confirmed; PC, Pathologically confirmed; NR Not reported; PB, Population–based; HB, Hospital–based; HWE, Hardy–Weinberg equilibrium in control population; PCR–RFLP, Polymerase chain reaction-restriction fragment length polymorphism.