Patient characteristics and periodontal status.

a0 = no evidence of inflammatory infiltration, 1 = slight inflammatory infiltration, 2 = moderate inflammatory infiltration and 3 = severe inflammatory infiltration. b0 = no CD3 positive cells, 1 = low amount of CD3 positive cells, 2 = moderate amount of CD3 positive cells, 3 = high amount of CD3 positive cells and – = not enough material to perform staining. cSignificant difference between periodontitis-affected and healthy sites (p<0.01). dSignificant difference between periodontitis-affected and healthy sites (p<0.05).