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. 2016 Nov 4;7:519. doi: 10.3389/fphys.2016.00519

Table 2.

Statistics for subgroup analyses.

Subgroup No. of studies Statistics for each subgroup
OR (95%CI) P-value I2-value
All studies 15 2.531(1.927–3.324) 0.000 79.385
QUALITY
High (7–9) 6 2.474 (1.634–3.748) 0.000 87.318
Moderate (4–6) 9 2.655 (1.800–3.916) 0.000 65.589
REGIONS
European countries 12 2.844 (1.954–4.139) 0.000 79.974
USA 2 1.682 (1.181–2.396) 0.000 76.001
Asian countries 1 8.790 (2.363–32.699) 0.001 0.000
ASSESSMENT OF PERIODONTAL DISEASE
With radiological examination 7 2.740 (1.631–4.605) 0.000 86.502
Without radiological examination 8 2.520 (1.776–3.576) 0.000 70.161
NUMBER OF CONFOUNDING FACTORS
≥5 5 1.698 (1.329–2.170) 0.000 66.903
<5 10 3.657 (2.219–6.027) 0.000 79.306

OR, odds ratio; CI, confidence interval.