Table 1.
Characteristics of the sample with respect to the variables of interest
| Variables | Total sample | Fluorine group | Laser group | Placebo group | P |
|---|---|---|---|---|---|
| n (%) | 28 (100) | 9 (32.1) | 10 (35.7) | 9 (32.1) | |
| Age (years) | 48.4 | 47.7 | 48.9 | 48.7 | 0.971* |
| Sex | |||||
| Female | 22 | 8 | 6 | 8 | 0.093† |
| Male | 6 | 1 | 4 | 1 | |
| Schooling (years) | |||||
| <8 | 7 | 4 | 2 | 1 | 0.311† |
| ≥8 | 21 | 5 | 8 | 8 | |
| Family income (SM) | |||||
| <3 | 22 | 5 | 9 | 8 | 0.124† |
| ≥3 | 6 | 4 | 1 | 1 | |
| Gingival recession (mm) | 3.5 | 2.8 | 3.8 | 3.9 | 0.123* |
*ANOVA test for independent samples; †Chi-square test, ‡P≤0.05. n – Number; SM – Minimum wages; mm – millimeter