Table 2.

Time trends in individual and contextual characteristics of adults age 15–49 (n = 64,829 person-periods).

Characteristic/Year	Baseline Year
	1989	1991	1993	1997	2000	2004	2006	2009
Individual characteristics
Temporary migration	7.0%	7.6%	6.7%	8.7%	13.1%	17.9%	16.7%	20.8%
Permanent migration	7.2%	7.1%	11.6%	8.8%	10.1%	8.8%	11.3%	9.7%
Individual attrition	4.5%	4.5%	5.3%	4.1%	6.1%	3.7%	5.5%	5.2%
Household attrition	5.5%	8.0%	5.3%	8.5%	11.2%	8.2%	13.1%	8.6%
Mean age	29.6	30.3	30.6	31.5	32.1	31.9	32.0	32.8
Less than primary edu.	22%	20%	18%	13%	9%	6%	6%	6%
Primary edu.	24%	24%	24%	22%	19%	20%	17%	17%
Lower middle edu.	35%	38%	39%	40%	43%	45%	44%	44%
Upper middle edu.	13%	14%	15%	16%	18%	17%	17%	14%
Technical school edu.	3%	2%	3%	5%	6%	6%	7%	7%
University edu.	2%	2%	1%	2%	4%	4%	5%	6%
Education missing	2%	1%	1%	1%	1%	3%	4%	6%
Household characteristics
Migrant network	0.32	0.34	0.40	0.28	0.38	0.63	0.85	0.83
Consumer assets	3.95	4.13	4.29	4.94	5.26	5.78	6.05	6.49
Business assets	2.87	2.92	3.00	3.14	3.25	3.36	3.36	3.37
Crop income	2411	1942	2752	2105	3401	3536	3484	3963
Transfer income	599	1074	1288	1700	4227	3434	3900	3877
Other income	9811	11355	13415	17447	15850	20742	33615	37090
Crop income share	19%	14%	16%	10%	14%	13%	8%	9%
Other income share	77%	79%	77%	82%	68%	75%	82%	83%
Transfer income share	5%	7%	7%	8%	18%	12%	10%	9%
Community characteristics
Urbanicity index	43.3	44.8	44.8	51.1	56.9	59.7	61.4	64.7
County characteristics
Temperature anomaly	−0.17	−0.79	−0.24	0.46	0.77	0.44	0.28	−0.69
Precipitation anomaly	0.11	−0.15	−0.16	0.09	0.28	−0.21	0.09	−0.28

Note: Variables are as defined in Table 1, plus income which is defined as net household income from this source in inflation-adjusted 2011 RMB.