Table 3.

Comparison of sample characteristics before and after propensity score matching (PSM)

	Before PSM				After PSM
	UEBMI (%)	URBMI (%)	Standardized Bias (%)	P value	UEBMI (%)	URBMI (%)	Standardized Bias (%)	P value
Age (years)
45–59	41.83	33.40	−17.47	< 0.001	34.12	34.02	−0.21	0.777
> 59	25.34	36.57	24.47	< 0.001	39.81	39.89	0.16	0.831
Female	49.77	61.47	23.71	< 0.001	60.95	60.92	−0.06	0.927
Workplaces
Enterprise	49.71	0.43	− 138.21	< 0.001	0.95	0.96	0.10	0.970
Individual	32.85	0.36	−97.04	< 0.001	0.79	0.78	−0.11	0.966
State-owned workplaces	16.85	99.02	302.68	< 0.001	98.25	98.25	0	1.000
Wages
Medium	7.71	3.73	−17.20	< 0.001	8	8.21	0.77	0.306
High	27.87	16.05	−28.85	< 0.001	35.55	35.34	−0.44	0.559