Table 2

Characteristics of screened subjects

	Male (N=42 469)		Female (N=57 531)		Total (N=100 000)
	N or mean	% or SD	N or mean	% or SD	N or mean	% or SD	p Value*
Age (years)							<0.001
40–49	10 454	24.62	14 594	25.37	25 048	25.05
50–59	13 651	32.14	19 536	33.96	33 187	33.19
60–69	13 993	32.95	18 326	31.85	32 319	32.32
70–75	4256	10.02	4979	8.65	9235	9.24
Total†	57.06	9.27	56.59	10.68	56.79	10.11	<0.001
Han nationality	34 838	82.03	46 493	80.81	81 331	81.33	<0.001
Hukou status							<0.001
Non-agricultural	12 661	29.81	18 652	32.42	31 313	31.31
Agricultural	21 716	51.13	29 109	50.60	50 825	50.83
Unified Residency Hukou	8088	19.04	9765	16.97	17 853	17.85
Do not have Hukou	4	0.01	5	0.01	9	0.01
Marital status							<0.001
Married with spouse	40 543	95.46	52 244	90.81	92 787	92.79
Widowed, separated, divorced	1379	3.25	4880	8.48	6259	6.26
Never married	311	0.73	68	0.12	379	0.38
Unknown	173	0.41	256	0.44	429	0.43
Refuse to answer	63	0.15	83	0.14	146	0.15
Education							<0.001
Illiterate	1283	3.02	4195	7.29	5478	5.48
Less than primary school	1201	2.83	2590	4.50	3791	3.79
Primary school	12 837	30.23	18 902	32.86	31 739	31.74
Middle school	14 757	34.75	18 310	31.83	33 067	33.07
High school	8508	20.03	9689	16.84	18 197	18.20
College or university	3736	8.80	3681	6.40	7417	7.42
Household income (Yuan/year)							<0.001
<5000	5426	12.78	7996	13.90	13 422	13.42
5000–9999	2659	6.26	3888	6.76	6547	6.55
10 000–19 999	7078	16.67	11 418	19.85	18 496	18.50
20 000–50 000	15 646	36.84	19 369	33.67	35 015	35.02
>50 000	5352	12.60	6260	10.88	11 612	11.61
Unknown	1271	2.99	2198	3.82	3469	3.47
Refuse to answer	5037	11.86	6402	11.13	11 439	11.44
Current smoker	16 921	39.84	1503	2.61	18 424	18.42	<0.001
Alcohol drinker							<0.001
Never	22 148	52.15	51 703	89.87	73 851	73.85
Monthly or less	3194	7.52	2293	3.99	5487	5.49
2–4 times a month	5453	12.84	1487	2.58	6940	6.94
2–3 times a week	11 337	26.69	1405	2.44	12 742	12.74

All values are n (%) except for Total† which is mean (SD).
*χ² test for proportion and two-tailed t test (or t′ test if equal variances not assumed) for means, α=0.05.