Table 3.

Demographic characteristics of respondents (N = 1178).

Variables	Group	n	%
University type	Medical university	544	46.2
	Comprehensive university	634	53.8
Grade	Bachelor’s degree	1127	95.7
	Graduate’s degree	51	4.3
Type of household registration a	Urban area	613	52.0
	Rural area	565	48.0
Annual per capita household income (CNY in thousand)	<50	414	35.1
	50~99	322	27.3
	100~149	203	17.2
	150~199	134	11.4
	≥200	105	8.9
Monthly living expenses (CNY)	<1000	136	11.5
	1000~1500	521	44.2
	1500~2000	349	29.6
	≥2000	172	14.6
The educational level of father	≤Junior high school’s degree	412	35.0
	High school’s degree	363	30.8
	College’s degree	369	31.3
	≥Graduate’s degree	34	2.9
The educational level of mother	≤Junior high school’s degree	521	44.2
	High school’s degree	333	28.3
	College’s degree	299	25.4
	≥Graduate’s degree	25	2.1
Sex history	Yes	256	21.7
	No	922	78.3

Note: ^a it is known as Hukou status in China, a public certificate book that registers and certifies a natural person according to their household, and records the natural person’s name, date of birth, relatives, marital status, etc. Currently, there are two main types of urban and rural household registration. CNY: Chinese Yuan.