Table 4.

Change in the witnessed apnoea, snoring and Epworth Sleepiness Scale score after mandibular advancement device treatment in the success and failure groups according to the seven criteria

Criteria	No	Witnessed apnoea			Witnessed snoring			Epworth Sleepiness Scale
		Pre MAD	Post MAD	P values†	Pre MAD	Post MAD	P values†	Pre MAD	Post MAD	P values†
AHI<10/hour with MAD
Success	45	6.64	2.82*	0.047†	6.96	2.93*	0.022†	8.60*	3.90*	0.003†
Failure	52	6.83	3.63*		7.29	3.92*		11.26*	6.50*
AHI<15/hour with MAD
Success	60	6.75	3.13	0.999	7.07	3.25	0.671	9.59	4.65*	0.524
Failure	37	6.73	3.46		7.24	3.81		10.75	6.38*
AHI<20/hour with MAD
Success	72	6.74	3.10	0.534	7.13	3.38	0.717	9.81	4.89	0.688
Failure	25	6.76	3.72		7.16	3.72		10.61	6.39
AHI<10/hour and AHI reduction of >50% with MAD
Success	44	6.64	2.77*	0.033†	6.95	2.89*	0.016†	8.64*	3.59*	0.001†
Failure	53	6.83	3.66*		7.28	3.94*		11.17*	6.70*
AHI<15/hour and AHI reduction of >50% with MAD
Success	59	6.78	3.14	0.793	7.03	3.24	0.528	9.43	4.58*	0.295
Failure	39	6.68	3.45		7.29	3.82		10.97	6.42*
AHI<20/hour and AHI reduction of >50% with MAD
Success	61	6.77	2.95*	0.240	7.13	3.16*	0.322	9.54	4.24*	0.033†
Failure	36	6.69	3.78*		7.14	3.97*		10.84	7.06*
AHI reduction of >50% with MAD
Success	66	6.79	3.02	0.391	7.12	3.20*	0.252	9.59	4.20*	0.009†
Failure	31	6.65	3.77		7.16	4.03*		10.79	7.67*

*P value <0.05 for the unpaired t-test.

†P value <0.05 for the repeated-measure analysis of variance (adjusted for the age, sex, body mass index and compliance).

AHI, apnoea–hypopnoea index; MAD, mandibular advancement device.