Table 2.

Pearson’s correlation (r) and regression beta coefficient for memory scores and sleep measurements

		Independent variables
		Sleep Duration (hours)	Sleep Efficiency (percent)	Karolinska Sleep Quality Index
Immediate Recall (n=59)	Pearson’s r	0.044	0.2	−0.18
	β coefficient	0.042	0.025	−0.27
	p-value	0.74	0.12	0.16
Immediate Recognition (n=59)	Pearson’s r	−0.066	−0.037	−0.13
	β coefficient	−0.080	−0.0058	−0.25
	p-value	0.62	0.78	0.31
Delayed Recall (n=52)	Pearson’s r	0.028	−0.0020	−0.0081
	β coefficient	0.027	0.00025	−0.012
	p-value	0.85	0.99	0.96
Delayed Recognition (n=52)	Pearson’s r	0.21	0.12	0.15
	β coefficient	0.31	0.024	−0.35
	p-value	0.13	0.39	0.29