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Table 1 Characteristics of studies included in the meta-analysis

From: Association between COX2 -765G/C polymorphism and periodontitis in Chinese population: a meta-analysis

References

Type of periodontitis

Source of controls

Geographic area(s)

Case number

Control number

Cases

Controls

HWE

GG

GC

CC

GG

GC

CC

χ2

P

Ho, 2008 (15)

CP

HB

Taiwan

343

153

242

93

8

89

60

4

2.77

0.096

Ho, 2008 (15)

AP

HB

Taiwan

85

153

81

3

1

89

60

4

2.77

0.096

Sun, 2009 (16)

CP

PB

Guangdong

150

143

119

29

2

119

21

3

2.85

0.091

Xie, 2009 (17)

CP

HB

Guangdong

146

148

137

9

0

128

20

0

0.78

0.378

Loo, 2011 (18)

CP

PB

Sichuan

280

250

134

68

78

152

90

8

1.50

0.221

Li, 2012 (19)

CP

PB

Sichuan

122

532

55

33

34

316

204

12

10.24

0.001

Duan, 2012 (20)

CP

PB

Ningxia

273

284

205

57

11

223

54

7

2.72

0.099

  1. PB population-based, HB hospital-based, CP chronic periodontitis, AP aggressive periodontitis