Table 1 Anthropometric characteristic of the studied subjects along with the descriptives of the 1/HOMA-IR and HOMA2 indices and of the two insulin-sensitivity indices K_xgI and S_Iin the Full Sample and in the Sub-sample (not including extreme S_Ivalues)

BMI ≤ 24

Mean

41.7

166.8

62.7

22.4

4.4

33.0

Std. Dev.

18.5

9.8

9.5

1.7

0.6

13.2

Std. Err.

4.2

2.2

2.2

0.4

0.1

3.0

N

19

19

19

19

19

19

24>BMI ≤ 30

Mean

47.2

166.0

71.3

25.8

4.6

46.1

Std. Dev.

14.8

7.9

8.8

1.3

0.5

26.5

Std. Err.

3.2

1.7

1.9

0.3

0.1

5.6

N

22

22

22

22

22

22

30>BMI ≤ 40

Mean

49.5

163.0

91.5

34.3

4.3

70.0

Std. Dev.

17.5

8.3

12.4

2.7

0.5

46.4

Std. Err.

3.7

1.8

2.6

0.6

0.1

9.9

N

22

22

22

22

22

22

BMI>40

Mean

40.4

162.0

127.4

48.7

4.8

96.4

Std. Dev.

9.7

8.4

16.2

6.7

0.4

59.7

Std. Err.

2.9

2.5

4.9

2.0

0.1

18.0

N

11

11

11

11

11

11

Total

Mean

45.5

164.7

83.4

30.9

4.5

57.3

Std. Dev.

16.2

8.6

24.3

9.3

0.5

42.7

Std. Err.

1.9

1.0

2.8

1.1

0.1

5.0

N

74

74

74

74

74

74

Full Sample

1/HOMA-IR

HOMA2

K _xgI

S _I

BMI ≤ 24

Mean

1.4

1.64

1.6E-04

47.2

Std. Dev.

1.1

0.51

9.3E-05

205.8

Std. Err.

0.3

0.13

2.1E-05

47.2

N

19

16

19

19

24>BMI ≤ 30

Mean

1.0

1.37

1.3E-04

13.8

Std. Dev.

0.6

0.59

7.6E-05

64.6

Std. Err.

0.1

0.13

1.6E-05

13.8

N

22

20

22

22

30>BMI ≤ 40

Mean

0.8

1.16

8.4E-05

101.3

Std. Dev.

0.4

0.67

7.1E-05

246.9

Std. Err.

0.1

0.14

1.5E-05

52.6

N

22

22

22

22

BMI>40

Mean

0.4

0.73

2.8E-05

139.8

Std. Dev.

0.2

0.30

9.5E-06

270.9

Std. Err.

0.1

0.09

2.9E-06

81.7

N

11

11

11

11

Total

Mean

1.0

1.26

1.1E-04

67.1

Std. Dev.

0.8

0.62

8.5E-05

203.3

Std. Err.

0.1

0.08

9.9E-06

23.6

N

74

69

74

74

Sub-Sample

1/HOMA-IR

HOMA2

K _xgI

S _I

BMI ≤ 24

Mean

1.5

1.68

1.6E-04

1.4E-04

Std. Dev.

1.1

0.53

9.6E-05

8.9E-05

Std. Err.

0.3

0.15

2.4E-05

2.2E-05

N

16

13

16

16

24>BMI ≤ 30

Mean

1.0

1.40

1.3E-04

1.1E-04

Std. Dev.

0.6

0.59

7.8E-05

6.3E-05

Std. Err.

0.1

0.14

1.7E-05

1.4E-05

N

21

19

21

21

30>BMI ≤ 40

Mean

0.6

0.98

5.3E-05

7.5E-05

Std. Dev.

0.4

0.68

2.8E-05

7.8E-05

Std. Err.

0.1

0.21

8.5E-06

2.4E-05

N

11

11

11

11

BMI>40

Mean

0.4

0.70

2.8E-05

3.6E-05

Std. Dev.

0.2

0.30

1.0E-05

1.4E-05

Std. Err.

0.1

0.11

3.6E-06

4.8E-06

N

8

8

8

8

Total

Mean

1.0

1.27

1.1E-04

1.0E-04

Std. Dev.

0.8

0.65

8.5E-05

7.8E-05

Std. Err.

0.1

0.09

1.1E-05

1.0E-05

N

56

51

56

56