Table 1.
Characteristics of the treatment group (n = 19) and the control group (n = 19).
| Treatment | Control | p | ||
|---|---|---|---|---|
| Data in mean ± standard deviation | ||||
| Age | 26.2 ± 4.2 | 26.2 ± 4.2 | — | |
| Data in number (percentage) | ||||
| Gender | Male | 6 (32) | 6 (32) | — |
| Female | 13 (68) | 13 (68) | ||
|
| ||||
| Socioeconomic level | Low | 0 (0) | 0 (0) | — |
| High | 19 (100) | 19 (100) | ||
|
| ||||
| Tooth brushing | <2 | 6 (32) | 2 (11) | 0.23 |
| ≥2 | 13 (68) | 17 (89) | ||
|
| ||||
| Tobacco use | Yes | 3 (16) | 0 (0) | 0.23 |
| No | 16 (84) | 19 (100) | ||
|
| ||||
| Coloring drinks | Yes | 14 (74) | 18 (95) | 0.18 |
| No | 5 (26) | 1 (5) | ||
|
| ||||
| Bleaching treatment | Yes | 3 (16) | 1 (5) | 0.60 |
| No | 16 (84) | 18 (95) | ||