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. 2020 Jan 6;21:1. doi: 10.1186/s40510-019-0301-1

Table 1.

Baseline characteristics of participants in the two groups

Clear aligners (N = 35) Fixed appliances (N = 35)
Age (mean ± SD) 24.71 ± 7.48 22.51 ± 6.47
Sex (N, %)
 Male 13 (37%) 8 (23%)
 Female 22 (63%) 27 (77%)
Treatment time (mean ± SD) 21.54 ± 5.55 23.31 ± 6.25
Extraction (N, %) 19 (54%) 14 (40%)

SD standard deviation