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. Author manuscript; available in PMC: 2017 Aug 10.
Published in final edited form as: J Dent. 2014 Sep 23;42(12):1592–1602. doi: 10.1016/j.jdent.2014.09.004

Figure 4.

Figure 4

Model predicted estimates of the mean difference in fluorescence loss from baseline, for each treatment group at each follow-up time point. Estimates were based on the hierarchical random effects model with random effects for tooth and specimen nested within tooth and fixed effects for treatment, time, and treatment*time interaction. Vertical bars indicate model based estimates of 95% confidence intervals for the mean difference from baseline. Points are slightly staggered at each time point for better visualization of the vertical bars.