Table 2.

Income level in year 2010 and 2014

Income	2010			2014			t	P
	Median	Lower quartile	Upper quartile	Median	Lower quartile	Upper quartile
The poorest	1774	1038.2	2497.3	1500	700	2500	−10.12	< 0.001
Lower 20%	3849	3098.2	5000	5185.7	4085	6740	27.71	< 0.001
Medium 20%	5750	4730.8	7425	9366.7	7500	12,040	43.43	< 0.001
Higher 20%	8765.2	7210.5	11,200	13,450	11,001.9	17,500	39.81	< 0.001
The richest	17,500	12,806.9	25,605	24,237.5	18,712.7	33,380	6.99	< 0.001
Total	6381.3	3509	11,368.3	9836	4548	16,878.3	20.93	< 0.001

Note: Weighted proportions accounting for sampling design were used to calculate Income (CNY)

Since weighted income are skewed distribution, medians and interquartile ranges are given rather than means with standard errors

T-test P value for comparing income means of each categories between year 2010 and year 2013