Table 2.

Relationship between periodic limb movements during sleep and the severity of OSA

Parameter	Total (n=6,140)	Control (n=784)	OSA			P-value
			Mild (n=941)	Moderate (n=1,280)	Severe (n=3,135)
PLMI (events/hr)	4.22±12.02	4.29±11.35	6.10±16.05	5.26±14.27	3.21±9.38	<0.001a)
PLMAI (events/hr)	0.84±3.67	1.38±4.69	1.26±3.92	1.06±4.46	0.50±2.82	<0.001a)
PLMS (%)	9.3	8.7	13.1	11.4	7.4	<0.001b)

Values are presented as mean±standard deviation unless otherwise indicated.

OSA, obstructive sleep apnea; PLMI, periodic limb movement index; PLMAI, periodic limb movement with arousal index; PLMS, periodic limb movements during sleep.

P-values obtained through

^a)analysis of variance and

^b)chi-square test were used to compare the mild, moderate, and severe OSA groups.