Table 1.

Demographic Characteristics of the Participants

Variable	Type	Frequency	Percentage (%)
Gender	Male	628	35.1
	Female	1159	64.9
Age	18	747	41.8
	19	669	37.4
	20	289	16.2
	21	59	3.3
	22	14	1
	22+	4	0.4
Year of study	1st	1244	69.6
	2nd	482	27
	3rd	44	2.5
	4th or more	17	1
Birthplace	Urban	892	49.9
	Rural	895	50.1
Years of cell-phone usage	Less than 1 year	159	8.9
	0–3 years	429	24
	3.1–5 years	577	32.2
	5.1–7 years	413	23.1
	7.1–9 years	165	9.3
	Over 9 years	44	2.5
Average daily duration of smartphone usage (hour)	0–3	191	10.7
	3.1–6	873	48.9
	6.1–9	446	25
	More than 9	277	15.5
Average number of smartphone checks per day	Less than 50	1375	76.9
	51–100	215	12
	101–150	69	3.9
	More than 150	128	7.2