Table 3.

Socioeconomic status, social participation and health status of sample

Variables	Category	N	Percentage (%)/Mean ± SD
Income	< 10,000 yuan	3134	30.73
	10,000-30,000 yuan	1921	18.84
	30,000-9000 yuan	2700	26.48
	> 90,000 yuan	2442	23.95
Education	Illiteracy	5040	49.43
	Primary	3168	31.07
	Junior	993	9.74
	Senior and above	996	9.77
Occupation	Agriculture	6981	68.46
	Governmental & professional	1275	12.50
	Commercial & service	1941	19.04
Group exercise		10,171	4.21 ± 1.97
Organized social activities		10,114	1.31 ± 0.87
Interact with friends		10,178	4.14 ± 2.26
IADL		10,197	17.98 ± 6.32
MMSE		10,197	23.04 ± 8.52