Table 1 Basic characteristic of the study participants

Age (years)

59.69 ± 11.38

59.32 ± 11.37

61.96 ± 11.25

62.30 ± 10.67

8.303^a

Male (N (%))

192 (43.2)

184 (41.3)

180 (40.5)

192 (43.2)

1.022^b

Marital status (N (%))

4.916^b

 Currently married

367 (82.7)

388 (87.2)

366 (82.4)

376 (84.7)

 Currently not married

77 (17.3)

57 (12.8)

78 (17.6)

68 (15.3)

Educational level (N (%))

5.009^b

 Middle school or lower

323 (72.7)

294 (66.1)

312 (70.3)

304 (68.5)

 High school or higher

121 (27.3)

151 (33.9)

132 (29.7)

140 (31.5)

Income (yuan) (N (%))

2.167^b

 < = 2000

248 (55.9)

246 (55.3)

242 (54.5)

228 (51.4)

 > 2000

196 (44.1)

199 (44.7)

202 (45.5)

216 (48.6)

Family history of hypertension (N (%))

93 (20.9)

76 (17.1)

81 (18.3)

78 (18.5)

2.630^b

Smoking (%)

114 (25.7)

124 (27.9)

134 (30.2)

154 (34.7)

9.504-

BMI (kg/m²)

24.56 (22.24,26.61)

24.28 (22.21,26.77)

24.62 (22.32,27.00)

24.46 (22.51,27.00)

1.823^c

WC (cm)

85.00 (80.00,90.00)

85.00 (79.00,91.00)

86.00 (80.00,93.00)

87.00 (80.00,93.00)

17.539^c

FPG (mmol/L)

5.86 ± 1.73

5.33 ± 1.52

5.23 ± 1.55

5.54 ± 2.01

11.639^a

HbA1c (%)

4.20 (3.80,4.60)

4.70 (4.50,5.10)

5.30 (5.10,5.70)

6.50 (5.90,7.50)

1064.07^c

TG (mmol/L)

1.36 (0.97,1.89)

1.35,0.96,1.99)

1.45 (0.95,2.00)

1.53 (1.02,2.15)

8.107^c

TC (mmol/L)

4.92 (4.30,5.51)

4.98 (4.34,5.70)

4.96 (4.20,5.66)

5.00 (4.24.5.76)

2.206^c

Hypertension (N (%))

81 (18.2)

99 (22.2)

108 (24.3)

145 (32.7)

26.680^b