Table 1.

Baseline characteristics of enrolled students (n=2449)

	Men (n=1308)		Women (n=1119)		p
	n	%	n	%
Age, mean (sd)	20 (2)		20 (2)		0.386
Hometown					<0.001
Outside Akita	858	66	570	51
Within Akita	450	34	549	49
Living alone					<0.001
Alone	874	68	593	54
Not alone	420	32	513	46
Exercise					<0.001
Highest quartile	339	29	206	20
Second highest quartile	280	24	266	26
Second lowest quartile	270	23	282	28
Lowest quartile	280	24	256	25
Smoking					<0.001
Current	60	5	11	1
Past	45	3	13	1
Never	1204	92	1093	98
Alcohol					<0.001
5-7/week	33	3	13	1
3-4/week	60	5	28	3
1-2/week	280	21	199	18
Never-seldom	931	71	877	79
Social network service daily use
Text message	1101	84	1052	94	<0.001
Sound	204	16	197	18	0.182
Video	68	5	66	6	0.444
Either sound or video	231	18	217	19	0.264
Worries					<0.001
Financial strain	298	23	224	20
Academic record	313	24	253	23
Leisure	355	27	325	29
Social support	137	11	218	19
Physical activity	195	15	101	9
Anyone to consult					<0.001
Yes	957	73	934	83
None	346	27	187	17

The sum of the category that does not reach 2429 indicates missing values