Table 2 Distribution of categorical variables in participants in two groups (N, %)

sex

male

175

51.17

172

50.29

0.119

0.730

female

167

48.83

170

49.71

Education level

Below primary

20

5.85

22

6.43

6.567

0.161

primary school

84

24.56

83

24.27

junior high

135

39.47

152

44.44

high school

69

20.18

67

19.59

≥college

34

9.94

18

5.26

family history

no

131

38.30

32

9.36

80.048

<0.001

yes

211

61.70

310

90.64

body mass index

low weight

12

3.51

5

1.46

63.165

<0.001

normal

194

56.73

103

30.12

overweight

112

32.75

166

48.54

obesity

24

7.02

68

19.88

waist-to-hip ratio

normal

74

21.64

53

15.50

4.492

0.034

abnormal

268

78.36

289

84.50

blood type

AB

41

11.99

33

9.65

3.523

0.620

A

52

15.20

57

16.67

B

49

14.33

55

16.08

O

65

19.01

72

21.05

unknown

135

39.47

125

36.55

occupation

physical labor

154

45.03

152

44.44

12.197

0.016

mental work

90

26.32

71

20.76

freelance

26

7.60

17

4.97

no job

72

21.05

102

29.82

work/life pressure

no

217

63.45

222

64.91

3.08

0.544

little

96

28.07

85

24.85

more

23

6.73

24

7.02

great

6

1.75

10

2.92

Living environmental noise

no

231

67.54

223

65.20

3.22

0.521

little

85

24.85

89

26.02

more

21

6.14

27

7.89

great

5

1.46

3

0.88

Personal taste

salty

65

19.01

88

25.73

5.738

0.057

light

104

30.41

110

32.16

balance

172

50.29

146

42.69

sleeping time

inadequate

43

12.57

35

10.23

6.998

0.072

satisfy

31

9.06

49

14.33

sufficient

268

78.36

258

75.44

Sports habit

never

64

18.71

65

19.01

1.454

0.483

occasionally

116

33.92

129

37.72

regular

162

47.37

148

43.27

drinking behavior

never

236

69.01

251

73.39

2.068

0.558

occasionally

65

19.01

59

17.25

often

38

11.11

33

9.65

smoking behavior

never

225

65.79

219

64.04

6.544

0.087

Quit now

22

6.43

40

11.70

occasionally

20

5.85

24

7.02

always

72

21.05

61

17.84