Table 4.

Therapy response.

Therapy Response	All Patients	Subgroup 1	Subgroup 2	Subgroup 3	Subgroup 4	Subgroup 5	P
		AHI < 15 events/h	15 ≥ AHI < 30 events/h	30 ≥ AHI ≤ 50 events/h	50 > AHI ≤ 65 events/h	AHI > 65 events/h
Sher et al9 response	n = 593 (66.6%)	n = 8 (42.1%)	n = 237 (68.3%)	n = 260 (66.7%)	n = 66 (65.4%)	n = 22 (66.7%)	.23*
AHI < 21 events/h	n = 678 (76.2%)	n = 18 (94.7%)	n = 295 (85.0%)	n = 277 (71.0%)	n = 66 (65.4%)	n = 22 (66.7%)	< .0001**
50% reduction AHI	n = 618 (69.4%)	n = 8 (42.1%)	n = 237 (68.3%)	n = 267 (68.5%)	n = 80 (79.2%)	n = 26 (78.8%)	.01*

P value (chi-square test) compares the response rates between the 5 subgroups: *chi-square test, **Fisher’s exact test. AHI = apnea-hypopnea index