Table 1.

Demographic data of the study population

Variables	Onsite workers		Retired workers		P
	Number	Percent	Number	Percent
	(n = 2359)		(n = 612)
Sex
Male	1453	61.59	231	37.75	0.00
Female	906	38.41	381	62.25
Age, years
< 30	249	10.56	0	0.00	0.00
30–40	818	34.68	0	0.00
40–50	1100	46.63	4	0.65
50–60	185	7.84	105	17.16
60–70	7	0.30	159	25.98
70–80	0	0.00	245	40.03
≥ 80	0	0.00	99	16.18
Race/ethnicity
Han Chinese	1148	48.66	401	65.52	0.00
Zhuang minority	1109	47.01	189	30.88
Other ethnic groups	92	3.90	21	3.43
Missing	10	0.42	1	0.16
Marital status
Single	293	12.42	11	1.80	0.00
Married	1989	84.32	451	73.69
Widowed or divorced	73	3.09	149	24.35
Missing	4	0.17	1	0.16
Education
Middle school or lower	948	40.19	470	76.80	0.00
High school	1050	44.51	111	18.14
University/college or higher	358	15.18	29	4.74
Missing	3	0.13	2	0.33
Seniority, years
< 10	775	32.85	8	1.31	0.00
10–20	750	31.79	90	14.71
20–30	693	29.38	260	42.48
≥ 30	138	5.85	253	41.34
Missing	3	0.13	1	0.16
Smoking status
Current smoker	877	37.18	63	10.29	0.00
Former smoker	160	6.78	81	13.24
Never smoker	1317	55.83	466	76.14
Missing	5	0.21	2	0.33
Drinking status
Current drinker	1071	45.40	132	21.57	0.00
Former drinker	386	16.36	102	16.67
Never drinker	896	37.98	374	61.11
Missing	6	0.25	4	0.65
BMI, kg/m2					0.00
< 18.5	88	3.73	9	1.47
18.5–24	1445	61.25	232	37.91
24–28	670	28.40	251	41.01
≥ 28	136	5.77	94	15.36
Missing	20	0.85	26	4.25
Height, cm (mean ± SD)	163.18 ± 7.56		155.29 ± 7.78
Weight, kg (mean ± SD)	60.46 ± 9.95		57.99 ± 9.68

BMI body mass index. SD standard deviation