Table 6 Results of subgroup analysis for the relationship between combined effect of BMI/body size perception and metabolic syndrome by age group

BMI

Perception of body size

 ≤22.9

 -

1.00

1.00

1.00

1.00

 23.0–24.9

 -

9.13

4.87

17.12

10.74

6.00

19.21

9.13

6.46

12.88

5.32

4.04

7.02

 ≥25

 -

74.63

42.15

132.16

55.07

30.98

97.88

39.26

28.46

54.15

15.78

11.77

21.15

 ≤22.9

 Underweight

0.39

0.12

1.28

0.41

0.13

1.32

0.47

0.19

1.13

0.40

0.25

0.64

 Normal

1.00

1.00

1.00

1.00

 Overweight

5.29

1.04

26.88

2.46

0.43

14.13

1.15

0.60

2.20

1.25

0.47

3.38

 23.0-24.9

 Underweight

0.97

0.17

5.73

6.10

1.97

18.95

21.35

5.80

78.56

2.75

1.58

4.80

 Normal

4.81

1.95

11.89

6.97

3.36

14.46

7.02

4.37

11.27

3.54

2.36

5.31

 Overweight

15.32

6.06

38.74

12.20

4.77

31.22

7.96

5.13

12.37

4.44

2.59

7.60

 ≥25

 Underweight

23.41

3.74

146.52

7.82

1.38

44.43

10.18

2.27

45.72

6.52

3.14

13.53

 Normal

26.09

10.87

62.63

25.64

11.60

56.68

24.44

13.40

44.56

13.81

8.50

22.44

 Overweight

75.93

33.14

173.96

59.06

28.24

123.50

36.60

24.83

53.95

10.13

6.97

14.73

C-statistics

Only BMI Model

0.846*

0.856*

0.877*

0.784*

Combination Model

0.858*

0.864*

0.882*

0.791*