Table 3. Students’ sleep quality according to PSQI; Acceptable sleep quality: score < 5; Low sleep quality: score > 5 .

Substances	Sleep quality	Lifetime substance abuse			Substance abuse in past 3 month
		Yes	No	P value	Yes	No	P value
All substances	Acceptable	55	91	0.001	38	108	0.0001
	Low	46	30		41	35
Tobaccos	Acceptable	45	101	0.005	32	114	0.01
	Low	38	38		29	47
Opioids	Acceptable	8	138	0.005	3	143	0.004
	Low	13	63		9	67
Cannabis	Acceptable	23	123	0.224	14	132	0.173
	Low	17	59		12	64
Amphetamines	Acceptable	5	141	0.003	1	145	0.001
	Low	11	65		8	68
Sedatives	Acceptable	21	125	0.017	9	137	0.001
	Low	21	55		16	60
Alcoholic drinks	Acceptable	31	115	0.036	18	128	0.004
	Low	26	50		21	55
Inhalants	Acceptable	3	143	0.066	2	144	0.184
	Low	6	70		4	72
Hallucinogens	Acceptable	6	140	0.013	4	142	0.45
	Low	10	66		4	72
Cocaine	Acceptable	5	141	0.843	3	143	0.414
	Low	3	73		3	73
Other substances	Acceptable	2	144	0.974	0	146	0.342
	Low	1	75		1	75