| AT | Absent teeth |
| BOP | Bleeding on probing |
| CAL | Clinical attachment loss |
| DG | Differentiation grade |
| G | Gingivitis group |
| GC | Gastric cancer |
| p | Statistical significance |
| P | Periodontitis group |
| PD | Periodontal disease |
| PPD | Probing pocket depth |
| r | Correlation grade |
| SD | Standard deviation |
| SG | Patients from 1st Department of Surgery with gingivitis |
| SP | Patients from 1st Department of Surgery with periodontitis |
| TD | Tumour dimension |
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