Table 1.

Sociodemographic characteristics of the study population (n = 1,011).

Variables	Categories	Frequency	Percent (%)
Gender	Male	581	57.5
	Female	430	42.5
Age	18–29 years old	240	23.7
	30–39 years old	215	21.3
	40–59 years old	300	29.7
	60 years old or above	256	25.3
Marital status	Married	783	77.4
	Unmarried	210	20.8
	Divorced	7	0.7
	Widowed	11	1.1
Education status	Middle school or below	261	25.8
	High school or vocational senior high school	420	41.5
	College diploma or above	330	32.7
Monthly per capita household income	RMB 2,000 or below	31	3.1
	RMB 2,001–3,000	449	44.4
	RMB 3,001–4,000	227	22.5
	RMB 4,001–5,000	202	20.0
	5,000 or above	102	10.1