Table 2.

Characterization and comparison of polysomnography data before and after RME.

Variables	Group	Pre-RME M (SD)	Post-RME M (SD)	Difference in dimension (d)	p Pre-Post	p interaction group*time
AHI	Total	1.49 (1.32)	2.07 (2.85)	0.22	0.289
	Primary snoring	0.83 (1.08)	1.87 (3.65)	0.32	0.266	0.352
	OSA	2.26 (1.19)	2.33 (1.41)	0.05	1.000
	group p	0.005	0.710
OAHI	Total	1.07 (1.09)	1.23 (1.47)	0.11	0.570
	Primary snoring	0.37 (0.30)	1.08 (1.67)	0.46	0.124	0.095
	OSA	1.89 (1.12)	1.42 (1.22)	0.43	0.163
	group p	<0.001	0.599
CAHI	Total	0.43 (0.70)	0.73 (1.54)	0.21	0.338
	Primary snoring	0.48 (0.84)	0.76 (2.03)	0.16	0.585	0.983
	OSA	0.36 (0.52)	0.68 (0.56)	0.47	0.205
	group p	0.684	0.904
RDI	Total	1.60 (1.39)	1.98 (2.82)	0.14	0.489
	Primary snoring	0.94 (1.13)	1.91 (3.64)	0.30	0.300	0.236
	OSA	2.37 (1.29)	2.07 (1.30)	0.21	0.431
	group p	0.008	0.895
Basal SpO2	Total	96.43 (0.94)	96.29 (1.37)	0.12	0.508
	Primary snoring	96.71 (0.87)	96.82 (0.89)	0.14	0.629	0.213
	OSA	96.11 (0.96)	95.60 (1.62)	0.33	0.309
	group p	0.124	0.032
Mean SpO2	Total	95.60 (1.26)	95.12 (1.67)	0.37	0.104
	Primary snoring	96.00 (1.18)	95.57 (1.66)	0.38	0.191	0.930
	OSA	95.12 (1.22)	94.54 (1.57)	0.38	0.346
	group p	0.087	0.146
Min SpO2	Total	90.83 (3.03)	91.00 (2.75)	0.06	0.749
	Primary snoring	92.54 (1.81)	92.15 (1.82)	0.16	0.568	0.243
	OSA	88.82 (2.99)	89.50 (3.10)	0.25	0.331
	group p	0.001	0.018
DI	Total	1.28 (1.25)	1.54 (1.60)	0.19	0.315
	Primary snoring	0.63 (0.92)	0.79 (0.98)	0.15	0.594	0.620
	OSA	2.05 (1.17)	2.52 (1.75)	0.28	0.419
	group p	0.003	0.007

Results presented in the form: mean (standard deviation).

RME, Rapid Maxillary Expansion; Pre, Baseline; Post, 6-months after treatment; M, Mean; OSA, Obstructive Sleep Apnea; AHI, Apnea-Hypopnea Index; SpO₂%, Average Overnight Arterial Oxygen Saturation (basal, mean, min: minimum); OAHI, Obstructive Apnea/Hypopnea Index; CAHI, Central Apnea/Hypopnea Index; RDI, Respiratory Disorder Index, saturation index; DI, Desaturation Index.