Table 1 The basic characteristics of study population.

Variables	Exposed group (n = 75)	Non-exposed group (n = 160)	t/χ²	P
Age (mean ± SD), years	55.1 (0.8)	54.6 (2.6)	1.45	0.149
Height (mean ± SD), cm	160.79 (7.77)	160.86 (8.29)	0.06	0.949
Weight (mean ± SD), kg	63.27 (10.1)	62.77 (10.83)	0.36	0.720
WC (mean ± SD), cm	85.86 (10.57)	82.97 (9.78)	2.20	0.029
BMI (mean ± SD), kg/m²	24.43 (3.2)	24.27 (3.85)	0.34	0.737
FPG (mean ± SD), mmol/L	6.12 (2.17)	5.68 (1.41)	1.69	0.094
TG (mean ± SD), mmol/L	1.78 (1.05)	1.77 (1.13)	0.08	0.932
HDL-C (mean ± SD), mmol/L	3.05 (0.89)	2.87 (0.77)	0.08	0.934
LDL-C (mean ± SD), mmol/L	1.27 (0.34)	1.27 (0.33)	1.64	0.102
DBP (mean ± SD), mmHg	83.1 (11.5)	82.57 (10.55)	0.37	0.710
SBP (mean ± SD), mmHg	127.92 (18.04)	128.82 (17.24)	0.39	0.694
PA level n (%)			1.281	0.258
Non-vigorous	69 (80.2)	136 (73.9)
Vigorous	17 (19.8)	48 (26.1)
Meat n (%)			0.227	0.634
Non-daily	54 (62.8)	121 (65.8)
Every day	32 (37.2)	63 (34.2)
Vegetable n (%)			1.933	0.164
Non-daily	8 (9.3)	9 (4.9)
Every day	78 (90.7)	175 (95.1)
Fruit n (%)			0.045	0.831
Non-daily	54 (62.8)	118 (64.1)
Every day	32 (37.2)	66 (35.9)
Milk n (%)			0.000	0.983
Non-daily	73 (84.9)	156 (84.8)
Every day	13 (15.1)	28 (15.2)
Smoking n (%)			1.047	0.306
<400 cigarettes	52 (60.5)	123 (66.8)
≥400 cigarettes	34 (39.5)	61 (33.2)
Drinking n (%)			4.467	0.035
<Once per month	45 (52.3)	121 (65.8)
≥Once per month	41 (47.7)	63 (34.2)

Abbreviations: WC, waist circumference; BMI, body mass index; FPG, fasting plasma glucose; TG, triglyceride; HDL-C, high-density lipoprotein cholesterol; LDL-C, low-density lipoprotein cholesterol; DBP, diastolic blood pressure; SBP, systolic blood pressure; PA, physical activity.
Independent-samples t-test was used to compare difference of continuous variables between exposed group and non-exposed group, and Chi-square test was used to compare the difference of categorized variables between exposed group and no-exposed group.

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