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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