Table 1.
Demographic characteristics of participants.
| Characteristics | Test group | Control group | P-value |
|---|---|---|---|
| Subjects (number) | 37 | 35 | |
| Age (mean ± SD years) | 52.5 ± 11.8 | 51.7 ± 11.3 | .71 |
| Gender (number of Female/Male) | 12/25 | 15/20 | .06 |
| Smoking status | .47 | ||
| Current smoker (number) | 0 | 0 | |
| Former smoker (number) | 3 | 5 | |
| Never smoked (number) | 34 | 30 | |
| Number of teeth examined* | 74 | 70 | .22 |
| Anterior teeth (number) | 5 | 10 | |
| Premolar teeth (number) | 53 | 50 | |
| Molar teeth (number) | 16 | 10 |
*Two teeth with chronic periodontitis were examined per subject for clinical, bacteriological and biochemical parameters.
Differences in age and gender between the two groups were assessed by Mann-Whitney U test, and those in smoking status and the number of teeth examined between the groups were evaluated by chi-square or Fisher's exact test, respectively.