Table 2. The demographic variables of participants ( n  = 101) .

Variables		N	(%)
Sex	Male	76	75.2
	Female	25	24.8
Age	30–34 years old	9	8.9
	35–39 years old	31	30.7
	40–44 years old	28	27.7
	45–49 years old	17	16.8
	50–54 years old	9	8.9
	55–59 years old	7	6.9
Educational attainment	Senior high school	11	10.9
	Junior college	16	15.8
	Bachelor	35	34.7
	Postgraduate school	39	38.6
Occupation	Electronic industry	48	47.5
	Manufacturing industries	26	25.7
	Information and communications industry	23	22.8
	Others	4	4.0
Length of use	3 mo	97	96.0
	Less than 6 mo (including 6 mo)	4	4.0
Place of residence	Central Taiwan	65	64.4
	Taipei City	14	13.9
	Northern Taiwan	22	21.8