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Table. 1.

Compatibility of the sample in terms of age, sex, the degree of crowding (Little’s Irregularity Index), and the severity of malocclusion (PAR index)

Variable OA (n = 20) FA (n = 20) p-value
Age (yr)* 23.60 ± 5.65 20.56 ± 4.51 0.0681
Sex
Male 12 (60) 13 (65) 1.0000
Female 8 (40) 7 (35)
PAR index* 7.70 ± 4.66 7.50 ± 3.18 0.8751
Little’s Irregularity Index* 4.69 ± 1.35 4.99 ± 1.88 0.5705

Values are presented as mean ± standard deviation or number (%).

PAR, Peer Assessment Rating; OA, orthodontic aligner group; FA, fixed appliance group.

*Independent t-test.

chi-squared test with Yates’s correction.

Korean J Orthod 2021;51:329~336 https://doi.org/10.4041/kjod.2021.51.5.329
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