Table 2 Crude and age-standardized prevalence of metabolic syndrome among the study participants stratified by sex in Shaanxi province, northwestern China

All

   20-30

21/267

7.9 ± 3.3

14/143

9.8 ± 4.9

7/148

4.7 ± 3.5

   30-40

68/374

18.2 ± 3.9

43/228

18.9 ± 5.2

47/205

22.9 ± 5.8

   40-50

101/343

29.4 ± 4.8

55/214

25.7 ± 5.9

66/199

33.2 ± 6.6

   50-60

93/228

40.8 ± 6.4

82/174

47.1 ± 7.5

112/221

50.7 ± 6.6

   ≥ 60

130/255

51.0 ± 6.2

36/80

45.0 ± 11.1

63/117

53.8 ± 9.2

   Crude

413/1467

28.2 ± 2.4

230/839

27.4 ± 3.0

295/890

33.1 ± 3.1

   Standardized*

25.9 ± 2.1

24.2 ± 2.4

0.693

29.0 ± 2.7

0.017

Male

   20-30

18/112

16.1 ± 6.9

8/61

13.1 ± 8.7

3/61

4.9 ± 5.6

   30-40

47/172

27.3 ± 6.7

28/86

32.6 ± 10.1

23/85

27.1 ± 9.6

   40-50

35/127

27.6 ± 7.8

26/86

30.2 ± 9.9

22/83

26.5 ± 9.7

   50-60

35/94

37.2 ± 9.9

22/64

34.4 ± 12.0

38/96

39.6 ± 10.0

   ≥ 60

46/120

38.3 ± 8.8

15/38

39.5 ± 6.3

27/50

54.0 ± 14.3

   Crude

181/625

29.0 ± 3.6

99/335

29.6 ± 5.0

113/375

30.1 ± 4.6

   Standardized*

27.6 ± 3.5

26.9 ± 3.7

0.643

27.2 ± 4.2

0.784

Female

   20-30

3/155

1.9 ± 2.2

6/82

7.3 ± 5.8

4/87

4.6 ± 4.5

   30-40

21/202

10.4 ± 4.2

15/142

10.6 ± 5.1

24/120

20.0 ± 7.3

   40-50

66/216

30.6 ± 6.1

29/128

22.7 ± 7.3

44/116

37.9 ± 9.0

   50-60

58/134

43.3 ± 8.5

60/110

54.5 ± 9.5

74/125

59.2 ± 8.7

   ≥ 60

84/135

62.2 ± 8.3

21/42

50.0 ± 15.8

36/67

53.7 ± 12.3

   Crude

232/842

27.6 ± 3.0

131/504

26.0 ± 3.8

182/515

35.3 ± 4.1

   Standardized*

24.4 ± 2.4

23.6 ± 3.0

0.842

30.2 ± 3.5

0.003