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Table 1 Summary of basic characteristics of 10 included meta-analyses

From: Can statistic adjustment of OR minimize the potential confounding bias for meta-analysis of case-control study? A secondary data analysis

Study

Year

Country

Summary OR

95% CI

Test of heterogeneity

Crude or adjusted OR to combineda

AMSTAR score

Lower

Upper

Lee PN [14]

2016

UK

1.22

1.09

1.37

No exact value, P < 0.001

Mixed OR

6

Chen Z [17]

2015

China

1.67

1.27

2.21

χ2 = 64.71, P < 0.00001

Mixed OR

9

Macacu A [15]

2015

France

1.30

1.10

1.54

χ2 = 91.85, P < 0.0001

Mixed OR

8

Chen C [16]

2014

China

1.54

1.35

1.73

I2 = 7.9%, P = 0.367

All adjusted OR

9

Ma J [18]

2011

China

1.23

1.12

1.40

χ2 = 32.68, P = 0.000

Mixed OR

6

Pirie K [19]

2008

UK

1.21

1.11

1.32

χ2 = 13.8, P = 0.0002

All adjusted OR

6

Sadri G [20]

2007

Iran

1.38

1.16

1.65

χ2 = 5.83, P = 0.32

All adjusted OR

6

Zhou XB [21]

2006

China

1.94

1.80

2.10

χ2 = 20.13, P < 0.01

All crude OR

7

Johnson KC [22]

2005

Canada

1.90

1.53

2.37

No exact value, P < 0.05

Mixed OR

6

Khuder SA [23]

2001

USA

1.41

1.14

1.75

χ2 = 34.6, P < 0.01

Mixed OR

7

  1. All crude OR: using only crude OR of original studies to combining summary effect size
  2. All adjusted OR: using only adjusted OR of original studies to combining summary effect size
  3. Mixed OR: using mixed crude OR and adjusted OR of original studies to combining summary effect size
  4. a CI confidence interval, AMSTAR A measurement tool to assess systematic reviews