| Correlations | PCR | ||
| r | P-value | ||
| Age | 0.134 | 0.02* | |
| Periodontitis (severity) staging | CAL | 0.330 | <0.001* |
| RBL | 0.221 | <0.001* | |
| NMTP | 0.180 | 0.002* | |
| Periodontitis Staging complexity | PPD | 0.313 | <0.001* |
| TM | 0.233 | <0.001* | |
| FI | 0.104 | 0.073 | |
| Periodontitis Progression (grading) | No. Cs/D | 0.321 | 0.002* |
| % HbA1c | 0.451 | 0.0311* | |