Table 1 Baseline characteristics of the study population

Age, years(Mean ± SD)

49.93 ± 10.43

50.16 ± 12.07

0.569

Body mass index (BMI), kg/m2(Mean ± SD)

23.44 ± 3.16

22.86 ± 3.09

< 0.001

Underweight (BMI < 18.5)(n,%)

53(5.03)

124(4.99)

0.004

Normal (18.5 ≤ BMI ≤ 25)(n,%)

710(67.36)

1802(72.57)

Preobese (25 ≤ BMI ≤ 30)(n,%)

253(24.00)

503(20.26)

Obesity (BMI ≥ 30)(n,%)

38(3.61)

54(2.17)

Stage (n,%)

–

–

I

311(29.51)

–

–

II

456(43.26)

–

–

III

214(20.30)

–

–

IV

4(0.38)

–

–

Missing

69(6.54)

–

–