Table 2.

Demographics of the study's participants^a.

Demographic variables		n	%	Demographic variables		n	%
Ethnicity	Mongols	4	0.6	Gender	Male	207	31.3
	Hui	16	2.41		Female	458	68.7
	Tibetan	3	0.45	Family incomes (RMB, ¥)	<20,000	453	68.1
	Hmong	119	17.89		20,000–50,000	127	19.1
	Yi	58	8.85		50,000–80,000	35	5.26
	Bourau	189	38.42		>80,000	22	3.31
	Buxqyaix	59	8.87		Missing	28	4.21
	Manchu	1	0.15	Mother's education level	Illiteracy	128	19.3
	Gaeml	42	6.32		Primary school or Junior High School	410	61.7
	Yao	17	2.56		High school or Technical Secondary School	69	10.4
	Bai	35	5.26		University, college or above	45	6.77
	Tujia	44	6.62		Missing	13	1.95
	Hani	10	1.5	Type of School	Ethnic school	127	19.1
	Dai	4	0.6		Non-ethnic School	513	77.1
	Li	2	0.3		Missing	25	3.76
	Lisu	2	0.3	Grade	Freshman	227	34.1
	Wa	3	0.45		Sophomore	257	38.7
	Shui	8	1.2		Junior and Senior	175	26.3
	Naxi	10	1.5		Missing	6	0.9
	Tu	1	0.15	Religion	Non-religious	601	90.4
	Chiang	3	0.45		Christianity	2	0.3
	Gelo	15	2.26		Mohammedanism	14	2.11
	Achang	1	0.15		Buddhism	43	6.46
	Pumi	2	0.3		Others	4	0.6
	others	16	2.41		Missing	1	0.15
	Missing	1	0.15	Father's education level	Illiteracy	24	3.61
Districts	Countryside	490	73.68		Primary school or Junior High School	424	63.8
	Town	127	19.1		High school or Technical Secondary School	136	20.5
	City	37	5.56		University, college or above	67	10.1
	Missing	11	1.66		Missing	14	2.11

^aN = 665.