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Frequency of the ABO Blood groups in study group.
| A | B | AB | O | Rh+ | Rh− | ||
|---|---|---|---|---|---|---|---|
| n | % | % | % | % | % | % | |
| Study Group (Total) | 1351 | 48.5 | 14.3 | 6.9 | 30.3 | 89.9 | 10.1 |
| Group I (Healthy) | 356 | 48.1 | 14.1 | 7 | 30.8 | 91 | 9 |
| Group II (Gingivitis) | 441 | 61.5 | 7.7 | 4.7 | 26.1 | 83.4 | 16.6 |
| Group III (Periodontitis) | 554 | 38 | 14.7 | 5.9 | 41.4 | 90.4 | 9.6 |
