pISSN 2234-7518
eISSN 2005-372X

Table. 3.

Comparison of the removal torques between the post-use and post-retention removal groups and between the sexes or age groups

Variable Post-use removal Post-retention removal p-value (post-use versus post-retention)
Removal torque (N cm) Removal torque (N cm)
Total 3.80 ± 2.34 399 4.66 ± 2.15 169 0.000***
Sex
Male 3.65 ± 2.29 137 4.83 ± 2.03 55 0.001**
Female 3.88 ± 2.36 262 4.59 ± 2.21 114 0.007**
p-value (sex) 0.356 0.492
Age (mean ± SD)
< 20 (15.96 ± 1.74) 3.34 ± 1.68 89 4.56 ± 2.17 25 0.003**
20–29 (23.56 ± 2.74) 3.83 ± 2.11 200 4.69 ± 2.30 105 0.001**
≥ 30 (42.78 ± 11.33) 4.09 ± 3.06 110 4.54 ± 1.82 39 0.271
p-value (age) 0.079 0.921

Values are presented as mean ± standard deviation or number only.

Independent t-test was performed for the comparison between the sexes and between the post-use and post-retention removal groups.

One-way analysis of variance was performed for the comparison between the age groups.

**Significant difference at p < 0.01 between the post-use and post-retention removal groups.

***Significant difference at p < 0.001 between the post-use and post-retention removal groups.

Korean J Orthod 2022;52:201~209 https://doi.org/10.4041/kjod21.217
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