Table 3—

Individual apnoea/hypopnoea index (AHI) and arousal indices in each sleep stage

Patient no.	Time h	AHI h⁻¹	RAI h⁻¹	Ratio % of all RE	SAI h⁻¹
1
NREM 1 and 2	4.4	38.7	37.6	97	13.0
REM	1.1	5.3	5.3	100	4.4
SWS	1.5	1.9	1.3	66	2.6
2^#
NREM 1 and 2	2.8	79.6	58.8	74	19.0
REM	0.02	0.0	0.0	0	50.0
SWS	0.6	52.6	21.0	40	10.5
3^#
NREM 1 and 2	3.7	57.8	42.4	73	34.5
REM	0.3	41.4	37.9	91	3.5
SWS	0.7	0.0	0.0	0	11.7
4^#
NREM 1 and 2	3.8	18.1	15.2	84	10.5
REM	0.8	0.0	0.0	0	8.6
SWS	2.2	0.9	0.0	0	3.2
5^#
NREM 1 and 2	2.7	18.7	17.5	94	15.3
REM	0.9	5.4	4.3	80	4.3
SWS	1.8	0.0	0.0	0	1.8
6
NREM 1 and 2	4.5	18.5	12.5	67	8.0
REM	0.5	14.9	10.6	71	8.5
SWS	1.5	15.6	2.0	13	2.0
7
NREM 1 and 2	4.1	51.8	44.8	87	4.3
REM	0.9	43.7	20.7	47	2.3
SWS	1.6	2.5	1.4	50	3.2
8^#
NREM 1 and 2	4.8	37.1	35.9	96	12.0
REM	1.4	8.6	2.2	25	2.9
SWS	1.3	0.0	0.0	0	5.4
9
NREM 1 and 2	3.5	24.3	12.7	52	12.2
REM	1.2	16.1	8.5	53	5.1
SWS	1.9	2.0	1.0	50	3.7
10^#
NREM 1 and 2	4.1	33.0	28.5	86	33.1
REM	0.8	30.5	21.9	72	11.0
SWS	1.2	0.0	0.0	0	3.3
11
NREM 1 and 2	5.4	50.1	47.3	94	4.4
REM	0.8	15.0	13.7	91	6.3
SWS	0.07	57.1	28.5	50	0.0
12^#
NREM 1 and 2	3.4	45.3	43.9	97	11.7
REM	1.5	0.0	0.0	0	9.3
SWS	1.1	0.0	0.0	0	4.5
13
NREM 1 and 2	3.7	55.8	25.5	45	13.8
REM	1.0	41.8	20.4	48	3.1
SWS	1.7	27.4	2.4	9	3.6
14
NREM 1 and 2	4.5	40.6	36.2	89	13.0
REM	1.5	2.7	0.7	25	2.7
SWS	0.9	12.5	4.5	36	13.6
15
NREM 1 and 2	3.4	25.7	20.7	80	20.4
REM	1.2	27.1	15.2	56	5.1
SWS	2.0	0.5	0.0	0	4.5

RAI: respiratory arousal index
RE: respiratory events
SAI: spontaneous arousal index
NREM: nonrapid eye movement
REM: rapid eye movement
SWS: slow wave sleep
^#: seven patients excluded from analysis of variance across the three sleep states, as their AHI in REM and/or SWS was zero