Age showed a trend for association with individuals with both diseases (p = 0.00001; OR = 3.6, 95% C.I. 0.9-10.7) and chronic periodontitis alone (p = 0.002; OR = 3.0; 95% C.I. 0.8-10.52), suggesting that the difference in the distribution of BRINP3 alleles between healthy and individuals affected by peri-implantitis is confounded by the difference in the age of both groups (healthy individuals were on average 8 years younger than the affected individuals; Table 1). This evidence concerns the gene BRINP3 and periodontitis.