Table 1.

Demographic and internet behaviors information of participants (n = 624)

	Variables	Number	Percentage (%)
Grade	Freshman	202	32.37
	Sophomore	173	27.72
	Junior	249	39.9
Gender	Male	257	41.19
	Female	367	58.81
Residence	City	269	43.11
	Town	355	56.89
One-child family and multi-child family	One child	213	34.13
	Multi-child	411	65.87
Parents’ marital status	Normal	566	90.7
	Divorced	33	5.3
	Other	25	4
Game time per day	> 4 h	50	8.01
	< 4 h	431	69.07
	Non	143	22.92
Total time spent playing the game	> 12 months	275	44.07
	< 12 months	349	55.93
Total		624	100