Table 2.
Baseline demographics of the study groups
| Test center | Test group | Control group | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Subjects (n) | Mean age (years) | Mean HS | Subjects (n) | Mean age (years) | Mean HS | |||||
| M | F | T | M | F | T | |||||
| Cologne | 16 | 13 | 29 | 62.6 ± 8.3 | 3.5 ± 0.51 | 17 | 11 | 28 | 62.2 ± 8.6 | 3.5 ± 0.51 |
| Leipzig | 8 | 9 | 17 | 60.3 ± 10.9 | 3.5 ± 0.50 | 6 | 13 | 19 | 55.9 ± 10.7 | 3.5 ± 0.59 |
| Geneva | 13 | 5 | 18 | 51.8 ± 15.4 | 3.1 ± 0.75 | 14 | 5 | 19 | 43.1 ± 14.0 | 3.2 ± 0.89 |
| Total | 37** | 27** | 64 | 59.0 ± 12.1* | 3.4 ± 0.61*** | 37** | 29** | 66 | 54.8 ± 13.5* | 3.4 ± 0.66*** |
Test Group, High-fluoride toothpaste (5000 ppm F); Control Group, Regular-fluoride toothpaste (1350 ppm F); n, Number; M, Male; F, Female; T, Total; HS, Surface hardness score.
*
P = 0.0682 (unpaired t-test)
**
P = 0.9786 (chi-squared test)
***
P = 0.8757 (unpaired t-test).