Table 4. Social jetleg and daytime sleepiness according to the demographics (N=133)

Characteristics		Social jetlag				Daytime sleepiness
		Day-shift		Night-shift
		M±SD	t or F(p)	M±SD	t or F(p)	M±SD	t or F(p)
Gender	Male	2.71±3.56	-0.224 (.824)	2.69±3.50	-0.148 (.873)	7.84±4.05	-0.521 (.578)
	Female	2.89±3.49		2.82±3.96		8.33±3.62
Age (year)	<30	2.40±2.86	-1.251 (.215)	3.21±3.70	1.975 (.050)	8.01±4.03	0.333 (.740)
	≥30	3.23±4.33		1.98±3.24		7.78±3.94
Education	≤Associate degree	2.61±3.26	-0.473 (.637)	2.85±3.52	0.512 (.610)	7.88±4.43	-0.130 (.897)
	≥Bachelor degree	2.90±3.89		2.53±3.63		7.97±3.37
Living arrangement	Alone	2.32±2.72	-1.423 (.158)	3.08±3.54	1.325 (.187)	7.32±3.49	-1.901 (.059)
	With others	3.23±4.28		2.26±3.56		8.62±4.41
Marital status	Unmarried	2.31±2.73	-1.806 (.078)	3.11±3.67	2.366 (.021)*	7.78±4.14	-0.635 .527
	Married	3.89±5.00		1.62±3.04		8.28±3.55
Working department	Approach control	2.73±3.58	0.001 (.999)	2.23±3.29	1.096 (.337)	8.11±3.72	0.213 (.809)
	Local/ground control	2.74±3.55		3.14±3.74		7.68±4.45
	Ramp control	2.78±3.60		3.11±4.16		8.25±1.58
Type of rotating shifts	D-N-O	1.94±2.69	0.437 (.647)	2.68±4.23	0.007 (.993)	6.86±5.11	0.553 (.577)
	D-D-N-N-O-O	2.86±3.65		2.70±3.47		8.04±3.97
	D-N-O-O	2.49±3.48		2.85±3.97		8.11±1.54

Note. D=day-shift; N=night-shift; O=day-off.