TABLE 2.

SLEEP CHARACTERISTICS: PATIENTS WITH DIABETES ACCORDING TO OBSTRUCTIVE SLEEP APNEA STATUS

Characteristic	All patients (n = 60)	Patients without OSA (n = 14)	Patients with OSA (n = 46)	P Value*
Actigraphy
Sleep duration, h†	6.1 ± 1.2	5.7 ± 1.0	6.2 ± 1.3	0.18
Polysomnography
Total sleep time, h	6.6 ± 1.1	7.2 ± 1.1	6.5 ± 1.0	0.02
Sleep efficiency, %	83.1 ± 11.6	89.7 ± 7.7	81.1 ± 11.9	0.01
Sleep latency, min	14.9 ± 18.6	9.3 ± 7.8	16.7 ± 20.5	0.19
Wake after sleep onset, min	66.1 ± 50.0	42.0 ± 34.0	73.5 ± 52.0	0.04
REM, %	22.3 ± 7.8	27.0 ± 7.2	20.9 ± 7.5	0.01
Stage 1 sleep, %	8.5 ± 5.3	6.1 ± 2.4	9.2 ± 5.7	0.06
Stage 2 sleep, %	62.9 ± 8.7	59.0 ± 9.0	64.1 ± 8.3	0.06
Slow wave sleep, %	6.4 ± 7.8	7.9 ± 8.6	5.9 ± 7.5	0.40
Microarousal index per hour of sleep	25.6 ± 13.4	20.1 ± 10.7	27.3 ± 13.8	0.07
Total AHI per hour of sleep	15.2 ± 14.8	2.0 ± 1.2	19.2 ± 14.8	<0.0001
REM AHI per hour of sleep	27.3 ± 21.0	3.4 ± 3.4	34.6 ± 18.5	0.003
Total obstructive events	96.5 ± 89.1	14.8 ± 9.1	121.3 ± 87.7	<0.0001
Number of obstructive events in REM sleep	36.5 ± 33.9	5.9 ± 4.6	45.8 ± 33.5	<0.0001
Total central events	1.7 ± 3.8	0.8 ± 1.4	2.0 ± 4.2	0.30
Total ODI per hour of sleep	11.0 ± 12.0	1.1 ± 0.6	14.0 ± 12.2	0.0002
REM ODI per hour of sleep	22.1 ± 18.2	2.3 ± 2.2	28.2 ± 16.6	< 0.0001
Total no. of desaturations: ≥3%	69.7 ± 71.5	8.0 ± 4.8	88.5 ± 71.8	0.0001
No. of desaturations in REM sleep: ≥3%	29.1 ± 28.3	3.9 ± 2.6	36.7 ± 28.1	<0.0001

Definition of abbreviations: AHI = apnea–hypopnea index; ODI = oxygen desaturation index; OSA = obstructive sleep apnea defined by five or more obstructive apneas and hypopneas per hour of sleep; REM = rapid eye movement.

Data are given as mean ± SD.

^*P values for unadjusted comparisons between patients with and without OSA are determined by t test for continuous variables.

^†Data for sleep duration measured by wrist actigraphy are reported in n = 59 subjects.