Probabilistic linguistic fuzzy cognitive maps: applications to the critical factors affecting the health of rural older adults

Table 2 The indicator systems of variables

First-level variables	Second-level variables	Indicators	Data sources	References
Health	R Self-rated health	The health status of self-reported	2014 CLHLS	[11]
The lifestyle of the rural older adults	\(C_{1}\) Balanced diet	The frequency of eating fresh fruits	2014 CLHLS	[4]
		The frequency of eating fresh vegetables	2014 CLHLS	[4]
	\(C_{2}\) Quality of sleep	The sleeping quality of self-reported	2014 CLHLS	[49]
	\(C_{3}\) Physical exercise	The presence of physical exercise	2014 CLHLS	[3, 50]
	\(C_{4}\) Unhealthy lifestyle	The presence of smoking	2014 CLHLS	[4]
		The presence of drinking	2014 CLHLS	[4]
	\(C_{5}\) mentality	The presence of sad, melancholic, or depressed emotion for two weeks or more in last 12 months	2014 CLHLS	[9, 14]
The health management of the rural older adults	\(C_{6}\) Preventive medical service utilization	The presence of regular physical examination once every year	2014 CLHLS	[4]
	\(C_{7}\) Chronic diseases management	The presence of cooperating with doctors to treat chronic diseases	2015 CHARLS	[51]
Socio-economic status	\(C_{8}\) Income	The financial level of the respondents' family	2015 CGSS	[15, 52]
	\(C_{9}\) Occupation	The main occupation of respondents before age 60	2014 CLHLS	[4, 53]
	\(C_{10}\) Education	The education of respondents	2014 CLHLS	[9, 53]
Living environment	\(C_{11}\) Environmental pollution	The severity of air/water/industrial waste pollution in respondents' living areas	2015 CGSS	[54]
	\(C_{12}\) Intergenerational relationship	The frequency of respondents to see child	2015 CHARLS	[55]

ISSN: 1472-6947