. 2017 Jun 16;152(4):751–760. doi: 10.1016/j.chest.2017.06.010

Table 2.

Demographic Data and Device Usage Characteristics of Various Patient Subgroups, Based on the Presence of CSA During CPAP Therapy

Demographic Data/Device Usage Data	OSA (n = 128,385)	Transient CSA (n = 2,547)	Persistent CSA (n = 1,162)	Emergent CSA (n = 912)	P Value
Age, y	56.2 ± 13.8^a^,^b^,^c	59.2 ± 13.7^a^,^d^,^e	62.4 ± 13.5^b^,^d	62.4 ± 13.0^c^,^e	< .001
CPAP mode during first 90 d, No. (%)
Automatic pressure	60,212 (46.9)^a^,^b^,^c	1,348 (52.9)^a^,^d^,^e	570 (49.0)^b^,^d^,^f	428 (46.9)^c^,^e^,^f	< .001
Fixed pressure	61,166 (47.6)	884 (34.7)	402 (34.6)	376 (41.2)
Both	7,007 (5.5)	315 (12.4)	190 (16.4)	108 (11.8)
Respiratory parameters in the first 90 d
AHI, /h	2.6 ± 3.1^a^,^b^,^c	8.1 ± 5.0^a^,^d^,^e	16.9 ± 10.0^b^,^d^,^f	10.2 ± 6.7^c^,^e^,^f	< .001
CAI, /h	0.4 ± 0.7^a^,^b^,^c	3.9 ± 2.5^a^,^d^,^e	10.2 ± 6.3^b^,^d^,^f	4.6 ± 2.8^c^,^e^,^f	< .001
Average median pressure, cm H₂O	9.8 ± 2.7^a	9.7 ± 2.5^a	9.8 ± 2.4	9.8 ± 2.6	.157
Average 95th percentile pressure, cm H₂O	11.0 ± 2.8^a^,^b	11.2 ± 2.5^a	11.2 ± 2.5^b	11.1 ± 2.8	< .001
Average median leak, L/min	6.0 ± 9.4^b^,^c	5.3 ± 6.8^e	5.4 ± 6.5^b^,^f	6.4 ± 7.3^c^,^e^,^f	< .001
Average 95th percentile leak, L/min	21.6 ± 18.3^b^,^c	21.2 ± 16.0^d^,^e	22.1 ± 15.3^b^,^d^,^f	23.5 ± 15.9^c^,^e^,^f	< .001

P values reported in the right-hand column of the table are those for testing the null hypothesis that all groups follow the same distribution; a P value < .05 indicates that there is a statistically significant difference across groups. To examine such differences further, pairwise tests between specific groups were conducted, with results shown as superscripts in the table. Values represent means ± standard deviation, or No. of patients (%). CAI = central apnea index; CSA = central sleep apnea.

Pairwise significance: P < .05, transient CSA vs OSA.

Pairwise significance: P < .05, persistent CSA vs OSA.

Pairwise significance: P < .05, emergent CSA vs OSA.

Pairwise significance: P < .05, persistent CSA vs transient CSA.

Pairwise significance: P < .05, emergent CSA vs transient CSA.

Pairwise significance: P < .05, emergent CSA vs persistent CSA.