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Table 2 Subgroup analysis

From: The association between periodontal disease and the risk of myocardial infarction: a pooled analysis of observational studies

Group Number of studies Pooled RR 95% CI P (heterogeneity) I2 (%)
All studies 22 2.02 1.59-2.57 0.000 86.3%
Location
 America 8 1.44 1.16-1.78 0.000 81.1%
 Asia 9 2.93 1.52-5.65 0.000 90.7%
 Europe 5 2.44 1.01-5.86 0.0033 61.8%
Gender
 Female 3 1.64 1.20-2.25 0.117 53.4%
 Male 4 1.18 0.96-1.44 0.026 67.6%
Exposure
 CAL 10 2.66 1.80-3.94 0.000 82.5%
 Others 12 1.65 1.20-2.27 0.000 87.3%
Study quality
 High 12 2.29 1.61-3.25 0.000 91.0%
 Low and moderate 10 1.66 1.20-2.29 0.001 66.5%
Number of participants
  > 1000 9 1.46 1.16-1.83 0.000 76.8%
  < 1000 13 2.69 1.68-4.30 0.000 88.3%