Table 4

Sociodemographic characteristics

Variable	Full sample (N=6545)		Subsample (n=6188)
Variable	n	%	n	%
Area
Beijing	2099	32.07	2077	33.56
Shanghai	2414	36.88	2379	38.45
Chongqing	2032	31.05	1732	27.99
Age (years)
<20	91	1.39	59	0.95
20–29	1942	29.67	1733	28.01
30–39	2485	37.97	2430	39.27
40–49	2027	30.97	1966	31.77
Gender
Male	2557	39.07	2367	38.25
Female	3988	60.93	3821	61.75
Educational attainment
Elementary school or lower	550	8.40	534	8.63
Junior high school	2487	38.00	2403	38.83
High school	1777	27.15	1654	26.73
Junior college	884	13.51	822	13.28
College or higher	847	12.94	775	12.52
Occupation
Labourer	1561	23.85	1437	23.22
White-collar worker	1342	20.50	1228	19.84
Service worker	2982	45.56	2880	46.54
Other	660	10.08	643	10.39
Family per capita monthly income (¥)
<1000	332	5.07	309	4.99
1000–2999	1737	26.54	1612	26.05
3000–4999	2528	38.62	2407	38.90
5000–6999	1126	17.20	1078	17.42
>7000	822	12.56	782	12.64
Type of household registration (hukou)
Rural	4400	67.23	4167	67.34
Urban	2145	32.77	2021	32.66
Marriage status
Married	5498	84.00	5498	88.85
Unmarried	690	10.54	690	11.15
Divorced/Widowed	357	5.45	–	–