Table 1. .
Mean Age of the Subjects and Duration of Follow-Up Between Various Time Points of Evaluationa
| Groups |
Age, y Mean ± SD |
Duration Between Various Time Intervals of Follow-Up, mo |
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| T0-T1, Mean ± SD |
T0-T2, Mean ± SD |
T0-T3, Mean ± SD |
T0-T4, Mean ± SD |
T0-T5, Mean ± SD |
||
| I (nonextraction) | 16.27 ± 1.40 | 1.12 ± 0.12 | 2.99 ± 0.20 | 6.01 ± 0.37 | 12.40 ± 0.60 | 16.19 ± 3.49 |
| II (first premolar extraction) | 16.55 ± 1.76 | 1.10 ± 0.12 | 3.02 ± 0.28 | 6.01 ± 0.43 | 12.46 ± 0.44 | 23.79 ± 3.02 |
a
SD indicates standard deviation.