Table 3.

Objective and Subjective Sleepiness Measures by Periodic Leg Movement Index Category (PLMI <15 and PLMI ≥15)

	PLMI<15*	PLMI≥ 15*
Subjects/Obs (1084/2335)	1572 observations (n=772)	763 observations (n=312)
	UNADJUSTD MODEL*
Characteristic	mean ± SE	mean ± SE	statistic	p-value
MSLT mean (847/1627)	11.6 ± 0.2	11.8 ± 0.2	F=0.34, df=132	p=0.56
Epworth mean (1082/2333)	8.7 ± 0.1	8.7 ± 0.2	F=0.00, df=230	p=0.98
Characteristic	n(%)	n(%)
MSLT <8 (847/1627)	304 (27.1%)	135 (26.7%)	χ2= 0.10	p=0.75
Epworth >10 (1082/2333)	503 (32.0%)	251 (32.9%)	χ2= 0.22	p=0.64
EDS	246 (15.7%)	142 (18.6%)	χ2= 3.26	p=0.07
	ADJUSTED MODEL†
Characteristic	mean ± SE	mean ± SE	statistic	p-value
MSLT mean (847/1627)	11.6 ± 0.2	11.3 ± 0.3	F=1.44, df=132	p=0.23
Epworth mean (1082/2333)	9.0 ± 0.2	9.2 ± 0.2	F=2.53, df=210	p=0.11
	UNADJUSTD MODEL*		ADJUSTED MODEL†
Characteristic	Odds Ratio (95% CI)*		Odds Ratio (95% CI)†
MSLT <8 (847/1627)	0.96 (0.75-1.24)		1.22 (0.93-1.61)
Epworth >10 (1082/2333)	0.96 (0.80-1.15)		1.04 (0.86-1.26)
EDS	1.24 (0.99-1.57)		1.26 (0.98-1.63)

Reported n(%) and mean ± SE based on observations, not subjects. p-values based on F statistic or χ2 test for homogeneity.

^†PLMI Category based Stanford’s PLM detector.

^*Unadjusted Model,

^†Adjusted for age, gender, depression, habitual sleep time, insomnia, total sleep time, sleep efficiency, cardiovascular disease, and presence of restless legs syndrome (RLS) symptoms. PLMI, periodic limb movement index based Stanford’s PLM detector; MSLT, multiple sleep latency test; EDS, excessive daytime sleepiness as described in Methods Section.