pISSN 2234-7518
eISSN 2005-372X

Table. 6.

Stepwise multiple regression analysis to predict the removal torques by using independent variables

Studied variable Regression coefficient
B β p-value
Post-use removal group
Removal torque by the no-drilling method (Y1)
Placement torque (X11) 0.101 0.230 < 0.001
Microimplant length (X12) 0.464 0.176 0.005
Post-retention removal group
Removal torque by the no-drilling method (Y21)
Unloading in-bone stay period (X21) 0.001 0.201 0.024
Removal torque by the pre-drilling method (Y22)
Microimplant diameter (X22) 12.075 0.376 0.013

Multiple linear regression equations: Y1 = –0.479 + 0.101 × X11 + 0.464 × X12; Y21 = 3.923 + 0.001 × X21; Y22 = –9.987 + 12.075 × X22.

B, unstandardized coefficient; β, standardized coefficient; R2, coefficient of determination. Adjusted R2 = 0.065, using the no-drilling method in the post-use removal group; adjusted R2 = 0.033, using the no-drilling method in the post-retention removal group; adjusted R2 = 0.121, using the pre-drilling method in the post-retention removal group.

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