Table 3.

Correlations of sleep/wake and clinical variables

	rs	P value
Number of nighttime awakenings
Overall neuropsychological function	–.44	0.029
Mean length of nocturnal awakenings
EPSa	0.41	0.030
Per cent wake during the day
Overall neuropsychological function	0.55	0.004
Minutes awake during the day
MMSEb	0.40	0.041
EPSa	–0.38	0.046
Antipsychotic dosec	–0.45	0.024
Duration of antipsychotic use	–0.60	0.001
Minutes napping during the day
Antipsychotic dose	0.41	0.043
Duration of antipsychotic use	0.49	0.010
Number of daytime naps
Overall neuropsychological function	–0.49	0.013

^aModified Simpson–Angus EPS Scale (Simpson and Angus, 1970).

^bMini Mental State Examination.

^cmg chlorpromazine equivalencies.