Three-dimensional oropharyngeal airway changes after facemask therapy using low-dose computed tomography: a clinical trial with a retrospectively collected control group

Progress in Orthodontics

Table 6 Descriptive statistics of the changes observed between T2 and T1 and the p-values of the statistical tests

Variable	Control group (N = 16)		Facemask group (N = 18)		Mean difference	p-value	95% CI
Variable	Mean	SD	Mean	SD	Mean difference	p-value	Lower	Upper
Total Oropharyngeal airway volume (mm³)	302.23	345.58	738.86	1109.37	−436.63	0.128	−1009.94	136.68
Retropalatal airway volume (mm³)	145.73	189.22	388.63	491.44	−242.90	0.065	−242.90	125.12
Retroglossal airway volume (mm³)	156.50	326.96	350.22	1040.18	−193.72	0.462	−193.72	258.44
Minimal cross sectional area (mm²)	1.66	34.20	−0.48	21.32	2.14	0.826	−17.53	21.81
Point-based analysis
Mean part analysis (mm)	0.25	0.30	0.58	0.61	−0.33	0.54	−0.67	0.01
Minimum part analysis (mm)	−2.38	1.13	−2.94	1.29	0.56	0.192	−0.30	1.41
Maximum part analysis (mm)	3.14	1.51	4.80	1.80	−1.67	0.007**	−2.82	−0.51