Table 5.

Correlation between participants’ variables and sleep quality.

Variable	Coefficients		t statistic	P value
	B	Std Error
Academic level	−0.001	0.00	−3.332	.001
Work during the day	0.030	0.010	3.112	.002
Work at night	−0.058	0.019	−2.981	.003
Time sleep	0.275	0.049	5.643	.000
Sleep hours	−0.136	0.027	−4.992	.000
Time wakeup	−0.016	0.035	−0.446	.655
Take coffee late in the night	0.064	0.047	1.357	.175
Use sleep pills	0.188	0.062	3.033	.003
Sleep latency	0.072	0.042	1.714	.087
Wake up times during sleep	−0.120	0.032	−3.707	.000
Snore	0.013	0.018	0.721	.471
Wake up due to noise	0.194	0.026	7.491	.000
Nocturnal eating	−0.037	0.042	−0.883	.377
Sleepwalking	−0.073	0.111	−0.663	.508
Sleep talking	−0.027	0.026	−1.021	.308
Nocturnal bruxism	−0.187	0.064	−2.923	.004
Restless leg syndrome	0.228	0.027	8.430	.000
Nightmares	0.079	0.031	2.550	.011
Feeling tired in the morning	0.185	0.027	6.834	.000
Daytime sleepiness	−0.077	0.037	−2.076	.038
Daytime sleepiness during lectures	−0.074	0.030	−2.458	.014
Daytime sleepiness during free times	0.108	0.033	3.327	.001
Daytime nap	0.116	0.033	3.536	.000
Sleep quality on night before exams	0.152	0.038	4.026	.000
Leisure time	0.272	0.036	7.563	.000
Living condition	0.055	0.043	0.576	.565
Model summary
R square	0.875
Adjusted R square	0.869
SE. of regression	0.405