CIE Lab*(DE) color changes over the period of use of dentifrice
| Categories | 3 days | 1 week | 2 weeks | p-value1 | p-value2 | ||
|---|---|---|---|---|---|---|---|
| ΔE* | Con. | 30 | 5.79±3.66a | 6.59±4.78a | 6.17±3.73a | 0.621 | <0.001 |
| Exp1 | 33 | 4.09±2.60a | 6.38±4.12a | 7.43±5.19ab | 0.005** | ||
| Exp2 | 29 | 4.96±2.86a | 8.98±4.24b | 9.34±3.83b | <0.001 | ||
| p-value3 | 0.094 | 0.043* | 0.022* | ||||
| p-value4 | 0.034* | 0.540 |
Values are presented as mean±standard deviation. 1Repeated measures ANOVA. 2Repeated measure ANOVA (between subject effects). 3One-way ANOVA. 4Repeated measure ANOVA (differences between groups over time). abSame letters means there is no significant difference between times by Tukey’s multiple comparison at a=0.05 in each group.
