Table 1. Demographics of participants for questionnaire (N = 2,175).

Variables	Count	Percentage (%)
Gender
Boy	1,095	50.3
Girl	1,080	49.7
Age
9-year-old	399	18.3
10-year-old	590	27.1
11-year-old	615	28.3
12-year-old	571	26.3
Residence
Rural	1,032	47. 5
City	1,143	52.6
Location
Xishuangbanna	731	33.6
Hangzhou	584	26.9
Kunming	860	39.5