Table 1.

Demographic information of respondents.

Sociodemographic variables	Frequency	Percentage (%)
City of Location
Wuhan	267	41.1
Chengdu	119	18.3
Shanghai	264	40.6
Age (years)
≤30	267	41.1
31–50	290	44.6
>50	91	14.0
Gender
Male	220	33.8
Female	430	66.2
Marital status
Married	380	58.5
Unmarried or others	270	41.5
Education
Junior high school or below	50	7.7
High school	134	20.6
College or above	466	71.7
Years of residence in a community
≤5	214	32.9
6–10	140	21.5
>10	296	45.5