Table 5: Linear mixed model analysis with parameter L* as dependent and angle as a covariate.

Tooth Estimates of Fixed Effects
12 Parameter Estimate SE Df T p-value 95% Confidence Interval
- - - - - - Lower Bound Upper Bound
Intercept 74.71 0.38 33.979 199.165 <0.001 73.95 75.48
Slope(angle) 0.43 0.15 33.149 2.842 0.008 0.12 0.73
Estimates of Covariance Parameters
Parameter Variance Estimate SE Wald Z p-value 95% Confidence Interval
- - - - - - Lower Bound Upper Bound
Repeated Measures Time=1 4.36 1.8 2.422 0.015 1.94 9.8
Time=2 3.54 1.47 2.407 0.016 1.57 7.99
Time=3 4.1 1.71 2.403 0.016 1.81 9.27
- Estimates of Fixed Effects
31 Parameter Estimate SE df t p-value 95% Confidence Interval
- - - - - - Lower Bound Upper Bound
Intercept 75.79 0.29 31.461 264.654 <0.001 75.21 76.38
Slope(angle) 0.34 0.12 26.021 2.866 0.008 0.1 0.58
Estimates of Covariance Parameters
Parameter Variance Estimate SE Wald Z p-value 95% Confidence Interval
- - - - - - Lower Bound Upper Bound
Repeated Measures Time=1 2.96 1.24 2.395 0.017 1.31 6.72
Time=2 2.28 0.99 2.31 0.021 0.98 5.32
Time=3 3.75 1.55 2.417 0.016 1.67 8.43