Table 1: Intergroup comparison of the ages at the initial and final stages of orthodontic treatment and treatment time (independent t test).

Variables GROUP 1
Mild Resorption
N = 507
GROUP 2
Moderate to Severe Resorption
N = 93
P
MEAN SD MEAN SD
Initial age (years) 14.21 2.45 14.57 2.67 0.203
Final age
(years)
16.02 2.56 16.99 2.97 0.001*
Treatment Time (years) 1.81 0.83 2.41 0.99 0.000*

* Statistically significant for P < 0.05.

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