Table 4.

Odds ratio for sleep quality and time spent using smartphone at bedtime among KSUMC non-medical employees, Riyadh, 2016 (n=369)

Time spent using smartphone at bedtime	Sleep quality		OR	95%CI	P
	Good	Poor
<15 min	78	24	1	0.5236-1.9098	-
15-30 min	70	47	2.1821	1.2118-3.9293	0.0093
31-45 min	33	35	3.4470	1.7817-6.6686	0.0002
46-60 min	20	16	2.6	1.1672-5.7918	0.0194
>60 min	14	32	7.486	3.4154-16.1571	<0.0001