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. 2021 Dec 6;22:40. doi: 10.1186/s40510-021-00386-0

Fig. 1.

Fig. 1

Distribution of treatment time (a), and the number of brackets lost (b), brackets repositioned (c), archwires used (d), archwire bends (e), and appointments (f) in groups 1 and 2. Pairwise comparisons were done using the Mann–Whitney U test and their test statistics (n.s., not significant; *, p < 0.05; ***, p < 0.001)