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.