Table 2.

Changes in the Volume and Cross-Sectional Area of the Nasal Airway Before (T0), Immediately After (T1), and 1 Year After (T2) Nonsurgical Miniscrew-Assisted Rapid Maxillary Expansion^a*

n = 14	T0	Δ T1–T0	Δ T2–T1	Δ T2–T0
Volume (mm3)
Nasal cavity	10,822.6 ± 2700.5	1061.6 ± 613.9*	648.6 ± 827.2*	1710.2 ± 881.6*
Nasopharynx	14,277.0 ± 2483.9	513.3 ± 727.8	429.1 ± 817.2	942.4 ± 821.0*
Total volume	25,099.6 ± 3427.8	1575.0 ± 881.8*	1077.7 ± 923.7*	2652.6 ± 221.2*
Area (mm2)
ANS-perp. plane	81.6 ± 10.4	14.6 ± 17.5*	7.4 ± 12.6	22.0 ± 15.4*
Choanae plane	436.8 ± 64.6	31.6 ± 34.9*	12.6 ± 45.5	44.2 ± 47.8*
C3 plane	303.8 ± 76.2	9.0 ± 83.3	20.0 ± 49.6	29.0 ± 89.7

^aData are presented as means ± standard deviations. Please refer to Table 1 and Figure 1 for the definition of each measurement. Paired t-tests were used for each measurement.

^*P < 0.05.