Table 3.

Partial correlations controlling for cognitive status

	1	2	3	4	5	6	7
1. Sleep Efficiencya	1	0.78	-0.36	-0.05	-0.74	-0.14	0.07
2. TSTb		1	-0.14	0.05	-0.39	-0.13	0.24*
3. SOLc			1	-0.11	-0.04	0.05	-0.03
4. Awakenings				1	0.17	0.01	0.07
5. WASOd					1	0.08	0.10
6. LOAe						1	0.09
7. Gait Speedf							1

(N = 90)

^**Correlation is significant at the 0.01 level (2-tailed)

^*Correlation is significant at the 0.05 level (2-tailed)

Sleep Efficiency^a= ratio of time in bed to time asleep in minutes.

TST ^b= total sleep time in minutes per polysomnography.

SOL^c= minutes until onset of sleep.

WASO ^d= minutes of wake after sleep onset.

LOA ^f= Level of assistance required. Lower scores indicate more assistance required.

Gait Speed ^g= speed in seconds to walk six meters.