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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