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Table 2 Geometric mean of U-NAG and prevalence of higher U-NAG by related factors

From: Air pollution and urinary n-acetyl-B-glucosaminidase levels in residents living near a cement plant

Variables

U-NAG, U/L

P*

Higher U-NAG (≥5.67), U/L

P**

GM

GSD

n

%

Sex

 Male

1.90

1.49

0.004

35

17.2

0.752

 Female

2.51

1.79

 

63

18.3

Age, years

 40–59

1.71

1.05

0.000

22

11.9

0.009

  ≥ 60

2.62

1.80

 

76

21.0

Occupation

 non-manual

2.14

1.66

0.070

62

16.8

0.307

 manual

2.55

1.62

 

36

20.3

Air pollution exposure

 LEG

2.63

1.35

0.242

8

12.1

0.071

 MEG-R

2.12

1.45

 

43

15.8

 MEG-D

2.36

2.34

 

47

22.5

Smoking

 none

2.30

1.82

0.448

83

18.4

0.552

 current

2.10

1.65

 

15

15.8

HTN, mmHg

  < 140/90

2.17

1.59

0.101

66

16.1

0.055

  ≥ 140/90

2.57

2.48

 

32

23.4

DM, HbA1c (%)

  < 6.5

2.14

1.52

0.007

71

15.8

0.006

  ≥ 6.5

2.93

3.55

 

27

27.6

Urine cadmium, μg/g cr

 1Q (0.09–0.44)

1.93

0.90

0.007

17

12.6

0.145

 2Q (0.44–0.75)

1.99

1.69

 

24

17.4

 3Q (0.75–1.16)

2.40

2.38

 

25

18.2

 4Q (1.16–8.91)

2.84

2.43

 

32

23.4

Urine mercury, μg/g cr

 1Q (0.09–0.42)

1.96

1.05

0.020

19

14.1

0.023

 2Q (0.42–0.63)

1.98

1.33

 

19

13.8

 3Q (0.63–0.93)

2.56

1.50

 

24

17.5

 4Q (0.93–4.16)

2.65

3.48

 

36

26.3

Blood lead, μg/dL

 1Q (0.77–2.13)

2.33

1.66

0.941

25

18.8

0.830

 2Q (2.13–2.70)

2.31

1.74

 

27

19.3

 3Q (2.70–3.50)

2.17

1.91

 

25

18.2

 4Q (3.50–10.37)

2.26

1.72

 

21

15.3

Total

2.27

1.80

 

98

17.9

  1. *p-value by independent t-test, ANOVA, calculated by logarithmically transforming variables
  2. **p-value by Chi-square test