Table 3.

Arousal Correlations with Sleep and Demographic Variables

	Arousal Index	Total sleep time	Stage 1a	SWSa	REMa
Total sleep time	−.67*
Stage 1a	.50*	−.49*
Stage 2a	−.41*	.57*	−.54*
SWSa	−.45*	.49*	−.55*
REMa	−.43*	.39*	−.32*	.02
Wake	.69*	−.82*	.44*	−.53*	−.38*
Stage changes	.39*	−.03	−.11	.37*	−.31*
Awakenings	.64*	−.49*	.37*	−.46*	−.30*
Time in bed	−.24	.59*	−.22	.19	.10
Sleep efficiency	−.71*	.89*	−.47*	.54*	.40*
REM latency	.19	.07	.10	.17	−.44*
Sexb	−.28	.41*	−.41*	.25	.07
BMI	.42*	−.40*	.22	−.36*	−.30*
Age	.58*	−.70*	.46*	−.62*	−.20

^aSleep stage as a percentage of the total sleep time. SWS refers to slow-wave sleep; REM, rapid eye movement sleep; BMI, body mass index.

^bMen coded as 1 and women as 2.

^*p < .01