Table 5.

Correlations among factors

		Females
		Timing	Efficiency	Duration	Alertness/Sleepiness	Regularity
Males	Timing	–	−0.07 (0.01)	−0.30 (<0.01)	0.03 (0.29)	−0.12 (<0.01)
	Efficiency	−0.07 (0.01)	–	0.11 (<0.01)	0.10 (<0.01)	0.34 (<0.01)
	Duration	−0.22 (<0.01)	0.32 (<0.01)	–	−0.06 (0.03)	−0.01 (0.86)
	Alertness/Sleepiness	−0.03 (0.30)	0.01 (0.64)	0.02 (0.50)	–	0.06 (0.03)
	Regularity	−0.17 (<0.01)	0.27 (<0.01)	0.07 (0.01)	0.09 (<0.01)	–

Cells show estimated correlation between factors (p-value).