Table 3. The Relationship Between Using Cell Phones After Lights are Out and Headache, Insomnia, Losing Energy, Tiredness, and Distractibility in Students of Mazandaran University of Medical Sciences.

Symptoms	OR	95% Confidence Interval		P Value
		Upper	Lower
Headache	42.22	86.55	20.59	.00
Insomnia	74.58	160.55	34.64	.000
Losing Energy	3.33	5.26	2.10	.03
Tiredness	0.57	0.90	0.36	.01
Distractibility	0.5	1.41	0.18	.1