# Association Between ABO Blood Type and Periodontitis: A Cross-Sectional Study

## TL;DR

This study found that people with blood types A and AB are more likely to have severe periodontitis compared to those with blood type B.

## Contribution

The study reveals a novel association between specific ABO blood types and periodontitis, particularly in men.

## Key findings

- Blood types A and AB had significantly higher odds ratios for severe periodontitis compared to blood type B.
- The association between blood type and periodontitis was significant only in men.
- Individuals with the A antigen had higher odds of severe periodontitis than those without it.

## Abstract

Objectives: This study used health-examination data from a large population to examine the association between ABO blood type and periodontitis, considering the influence of confounding factors.

Methods: The study analyzed 2,311 individuals who underwent health examinations, including oral health examinations and blood-type tests. The Community Periodontal Index was used to evaluate periodontal status. Logistic regression analysis was performed with severe periodontitis as the dependent variable and blood type and other variables as independent variables; odds ratios (ORs) and 95% confidence intervals (CIs) were calculated. The sex differences in the associations between severe periodontitis and either blood type or the presence or absence of blood-type antigens (A or B antigens) were also examined.

Results: There were 879 (38.0%), 500 (21.6%), 234 (10.1%), and 698 (30.2%) participants with blood types A, B, AB, and O, respectively. Individuals with blood types A and AB had significantly higher ORs for severe periodontitis compared to those who had blood type B (OR 1.45 [95% CI 1.01-2.08] and 1.88 [95% CI 1.17-3.01], respectively). The association between blood type and severe periodontitis was significant only in men. In the association between blood-type antigen status and severe periodontitis, those with blood type A or AB who had the A antigen had a significantly higher OR for severe periodontitis than those with blood type B or O who did not have the A antigen (OR 1.40, 95% CI 1.09-1.80).

Conclusion:Individuals with blood types A and AB tended to have a higher prevalence of periodontitis. Future studies should consider the potential influence of blood type on periodontal status.