Table 2.

Correlation between mean changes of bone thickness and potential influencing factors; r value (P value)

	ΔB1	ΔB1/B1 at T0	ΔB2	ΔB2/B2 at T0	ΔB3	ΔB3/B3 at T0
B1 at T0	− 0.288 (0.099)	− 0.341* (0.048)	− 0.183 (0.301)	− 0.286 (0.102)	0.093 (0.601)	− 0.075 (0.674)
B2 at T0	− 0.214 (0.225)	− 0.333 (0.055)	− 0.327 (0.059)	− 0.435* (0.010)	− 0.085 (0.631)	− 0.281 (0.107)
B3 at T0	− 0.051 (0.775)	− 0.144 (0.417)	− 0.152 (0.391)	− 0.238 (0.176)	− 0.196 (0.268)	− 0.403* (0.018)
θ at T0	− 0.078 (0.662)	− 0.163 (0.357)	− 0.139 (0.433)	− 0.194 (0.270)	− 0.324 (0.062)	− 0372* (0.030)
U1 to FH	− 0.386* (0.024)	− 0.303 (0.081)	− 0.279 (0.111)	− 0.191 (0.280)	− 0.359* (0.037)	− 0.265 (0.130)
U1 to Palatal plane	− 0.428* (0.011)	− 0.339* (0.050)	− 0.428* (0.012)	− 0.248 (0.157)	− 0.448* (0.008)	− 0.354* (0.040)
U1 labial surface to palatal plane	− 0.522** (0.002)	− 0.395* (0.021)	− 0.372* (0.030)	− 0.239 (0.174)	− 0.432* (0.011)	− 0.389* (0.023)
Bone labial surface to palatal plane	− 0.479** (0.004)	− 0.408* (0.017)	− 0.366* (0.033)	− 0.314 (0.070)	− 0.405* (0.018)	− 0.404* (0.018)
ΔB1	1	0.917*** (< 0.001)	0.838*** (< 0.001)	0.742*** (< 0.001)	0.667*** (< 0.001)	0.617*** (< 0.001)
ΔB1/B1 at T0	0.917*** (< 0.001)	1	0.861*** (< 0.001)	0.873*** (< 0.001)	0.689*** (< 0.001)	0.741*** (< 0.001)
ΔB2	0.838*** (< 0.001)	0.861*** (< 0.001)	1	0.938*** (< 0.001)	0.818*** (< 0.001)	0.771*** (< 0.001)
ΔB2/B2 at T0	0.742*** (< 0.001)	0.873*** (< 0.001)	0.938*** (< 0.001)	1	0.762*** (< 0.001)	0.832*** (< 0.001)
ΔB3	0.667*** (< 0.001)	0.689*** (< 0.001)	0.818*** (< 0.001)	0.762*** (< 0.001)	1	0.875*** (< 0.001)
ΔB3/B3 at T0	0.617*** (< 0.001)	0.741*** (< 0.001)	0.771*** (< 0.001)	0.832*** (< 0.001)	0.875*** (< 0.001)	1
Intrusion amount	0.243 (0.166)	0.223 (0.205)	0.186 (0.292)	0.213 (0.226)	0.392* (0.022)	0.386* (0.024)
Retraction amount	0.155 (0.380)	0.128 (0.472)	− 0.004 (0.983)	0.005 (0.978)	− 0.185 (0.294)	− 0.125 (0.483)

*P < 0.05, **P < 0.005, ***P < 0.001, statistically significant; Pearson’s correlation coefficient