Table 2:

The incidence of internet addiction between the baseline and follow-up surveys

Variable		N	Total	Incidence rate (%)	P-value
Total		108	1229	8.8
Mental health	Good	49	775	6.3	<0.001
	Poor	59	454	13.0
Gender	Boy	38	580	6.6	0.009
	Girl	70	649	10.8
Insomnia	No	99	1126	8.8	0.985
	Yes	9	103	8.7
Sleep quality	Good	89	1084	8.2	0.071
	Poor	18	141	12.8
Grooming appearance	No	35	314	11.1	0.089
	Yes	73	913	8.0
Snacking habits	Yes	52	480	10.8	0.043
	No	56	748	7.5
Habit of skipping meals	Yes	13	96	13.5	0.088
	No	95	1130	8.4
Exercise habit	No	54	507	10.7	0.053
	Yes	54	722	7.5

P-values were calculated with the chi-squared test.

In each section, missing data have been excluded from the statistical analyses.