Table 2 Characteristics of the participants by category of periodontitis severity (N = 996)
|  | Overall (N = 996) | Nonea (N = 162, 16.3%) | Mild-moderate (N = 479, 48.1%) | Severe (N = 355, 35.6%) |
|---|---|---|---|---|
Total PSA mean (SD), ng/mL | 2.32 (3.69) | 2.05 (2.39) | 2.31 (3.39)* | 2.43 (4.48)* |
Age mean (SD), years | 66.88 (6.09) | 66.69 (6.13) | 67.33 (6.12) | 66.37 (6.00) |
BMI mean (SD), kg/m2 | 24.59 (2.92) | 24.65 (2.85) | 24.66 (2.85) | 24.48 (3.05) |
Diabetes N (%) | Â | Â | Â | Â |
 No diabetes | 288 (28.9) | 44 (27.2) | 132 (27.6) | 112 (31.5) |
 Pre-diabetes | 438 (44.0) | 73 (45.0) | 217 (45.3) | 148 (41.7) |
 Diabetes | 270 (27.1) | 45 (27.8) | 130 (27.1) | 95 (26.8) |
Cigarette smoking status N (%) | Â | Â | Â | Â |
 Never | 545 (54.7) | 108 (66.7) | 260 (54.3) | 177 (49.9) |
 Current | 365 (36.6) | 45 (27.8) | 174 (36.3) | 146 (41.1) |
 Former | 86 (8.7) | 9 (5.5) | 45 (9.4) | 32 (9.0) |