. 2018 May 7;13(5):e0196557. doi: 10.1371/journal.pone.0196557

Table 1. Means and standard deviation (SD) values of enamel loss (μm) after intermittent or continuous use of mandibular or maxillary appliances.

Groups	Maxillary Appliance (μm)	Mandibular Appliance (μm)
Intermittent use	2.30 (± 0.81) ^a	1.67 (± 0.68)^b
Continuous use	2.44 (± 0.78)^a	1.65 (± 0.64)^b

Values followed by distinct letters differ significantly (two way ANOVA and Tukey’s Test, p < 0.05).