The Scientific World Journal / 2015 / Article / Tab 1

Research Article

Change of Mandibular Position during Two-Phase Orthodontic Treatment of Skeletal Class II in the Chinese Population

Table 1

Age at the beginning of phase 1 (T0), end of phase 1/beginning of phase 2 (T1) and end of treatment (T2), and duration of the treatment phases of the study sample () and the three subgroups ( in each subgroup).

Average age (years )Average time of treatment phases (years)
T0T1T2T0-T1T1-T2T0–T2

Whole study sample13.4 ± 1.2014.5 ± 1.2016.4 ± 1.501.1 ± 0.201.9 ± 0.803.0 ± 0.90
Positive group12.8 ± 1.07ns13.9 ± 1.12ns16.2 ± 1.92ns1.1 ± 0.27ns2.2 ± 0.74ns3.3 ± 0.82ns
Stable group13.9 ± 1.21ns15.0 ± 1.17ns16.6 ± 1.37ns1.1 ± 0.26ns1.6 ± 0.75ns2.7 ± 0.87ns
Negative group13.4 ± 1.07ns14.5 ± 1.08ns16.4 ± 1.32ns1.1 ± 0.25ns1.8 ± 0.77ns3.0 ± 0.85ns

SD: Standard deviation.
nsNon-significant, , , .