Skip to main content
. 2021 Aug 20;92(1):80–86. doi: 10.2319/122820-1037.1

Table 2.

Paired t-Tests From Objective and Subjective Analysis of Invisalign and Fixed Groups at T0, T1, and T2 a


Invisalign Group (n = 24)
Fixed Group (n = 20)
Mean
SD
P Value
Mean
SD
P Value
Upper boundary frequency (MHz)
 T0 × T1 –0.31 0.37 <.01** –0.11 0.37 .19
 T1 × T2 0.16 0.27 .01* 0.01 0.32 .89
 T0 × T2 –0.15 0.29 .02* –1.39 0.51 .06
Patient perception of speech alteration (mm)
 T1 × T2 39.99 17.91 .02* 26.15 17.58 0.30
a

SD indicates standard deviation.

* 

Significant by the Student's t-test at P < .05.

** 

Significant by the Student's t-test at P < .01.