TABLE 3.

Coefficients for wake up time.

	Estimate (β)	Standard error	T Value	Pr (>|t|)
Intercept	7.6253197	0.2041169	37.358
Day type (WD)	−1.8508299	0.0198301	−93.334	<2.2e-16
Work start time (h)	0.2683064	0.0054800	48.961	<2.2e-16
Work end time (h)	0.0080555	0.0038279	2.104	0.03534
Alarm clock usage (Yes)	−0.3427512	0.0219618	−15.607	<2.2e-16
Age (year)	−0.0380694	0.0008383	−45.410	2.699e-09
Gender (men)	0.1196623	0.0201149	5.949	4.01E-11
Sunset time (h)	0.0199459	0.0097665	2.042	0.04112