Table 6: Linear mixed model analysis with parameter a* 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 4.14 0.16 33.659 25.273 <0.001 3.8 4.47
Slope(angle) -0.28 0.06 31.677 -4.382 <0.001 -0.42 -0.15
Estimates of Covariance Parameters
Parameter Variance Estimate SE Wald Z p-value 95% Confidence Interval
- - - - - - Lower Bound Upper Bound
Repeated Measures Time=1 0.85 0.35 2.411 0.016 0.38 1.92
Time=2 0.59 0.25 2.366 0.018 0.26 1.35
Time=3 0.88 0.36 2.426 0.015 0.39 1.97
- Estimates of Fixed Effects
31 Parameter Estimate SE df t p-value 95% Confidence Interval
- - - - - - Lower Bound Upper Bound
Intercept 3.56 0.11 27.231 31.633 <0.001 3.33 3.8
Slope(angle) -0.15 0.05 20.275 -3.382 0.003 -0.25 -0.06
Estimates of Covariance Parameters
Parameter Variance Estimate SE Wald Z p-value 95% Confidence Interval
- - - - - - Lower Bound Upper Bound
Repeated Measures Time=1 0.57 0.25 2.281 0.023 0.24 1.34
Time=2 0.31 0.15 2.018 0.044 0.12 0.81
Time=3 0.6 0.25 2.348 0.019 0.26 1.38