Table 1 General characteristics of subjects with normal glucose tolerance (NGT), prediabetes and type 2 diabetes (T2DM)

Mean ± SD

Age (years)

58.64 ± 11.62

58.73 ± 11.69

58.64 ± 11.82

0.008, 0.992^a

No. (%)

0.971, 0.615

Income (yuans)

6.025, 0.049

 < 2000

203 (49.63)

179 (45.43)

215 (54.16)

 ≥ 2000

206 (50.37)

215 (54.57)

182 (45.84)

Regular exercise

2.223, 0.329

 Yes

78 (19.07)

86 (21.83)

83 (20.91)

 No

331 (80.93)

308 (78.17)

314 (79.09)

Smoking

1.946, 0.378

 Yes

74 (18.09)

57 (14.47)

70 (17.63)

 No

335 (81.91)

337 (85.53)

327 (82.37)

Excessive drinking

2.460, 0.292

 Yes

36 (8.80)

46 (11.68)

47 (11.84)

 No

373 (91.20)

348 (88.32)

350 (88.16)

Hypertension

20.666, < 0.001

 Yes

124 (30.32)

148 (37.56)

182 (45.84)

 No

285 (69.68)

246 (62.44)

215 (54.16)

BMI (kg/m²)

43.443, < 0.001

 < 25

298 (72.86)

234 (59.39)

200 (50.38)

 ≥ 25

111 (27.14)

160 (40.61)

197 (49.62)