Table 1.

Descriptive statistics of variables (N=58 602)

	Native population			Floating population			p-Value
Variables	Mean	SD	n	Mean	SD	n
Age	45.68	14.55	53 216	39.21	13.20	7298	0.000
Gender (male=1)	0.520	0.500	53 451	0.547	0.498	7359	0.000
Marriage (yes=1)	0.816	0.387	53 452	0.780	0.415	7359	0.000
Agricultural job (yes=1)	0.332	0.471	53 452	0.0467	0.211	7359	0.000
Registration (rural resident=1)	0.207	0.405	53 344	0.344	0.475	7239	0.000
Education	2.885	1.173	53 318	3.465	1.122	7325	0.000
Insurance (yes=1)	0.887	0.317	53 215	0.797	0.403	7217	0.000
Self-assessed health	3.615	1.010	53 417	3.821	0.901	7333	0.000
Smoking (yes=1)	0.270	0.444	53 413	0.241	0.428	7333	0.000
Drinking (yes=1)	0.188	0.390	53 411	0.190	0.392	7332	0.000
Physical activity (yes=1)	0.267	0.443	53 411	0.352	0.478	7331	0.000
Income (yuan)	27 181	33 214	35 652	45 947	43 219	5 097	0.000

SD: standard deviation.