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Table 1 Characteristics and univariate comparisons of urine 1-hydroxypyrene glucuronide (1-OHPG) concentration in 199 healthy subjects from Rio Grande de Sul

From: Higher urine 1-hydroxy pyrene glucuronide (1-OHPG) is associated with tobacco smoke exposure and drinking maté in healthy subjects from Rio Grande do Sul, Brazil

Characteristic Category N (%) 1-OHPG (pmol/ml) median (IQR) P-value [1]
Age quartile 1 <= 35 52 (26%) 1.90 (0.23–3.55) 0.027
Age quartile 2 >35 49 (25%) 1.90 (0.76–5.58)  
Age quartile 3 >45 52 (26%) 3.65 (1.36–7.58)  
Age quartile 4 >58 46 (23%) 1.55 (0.22–5.01)  
Sex, N (%) Males 98 (49%) 2.19 (1.02–4.95) 0.52
  Females 101 (51%) 2.03 (0.06–7.23)  
Residence, N (%) Rural 35 (18%) 1.97 (0.76–7.49) 0.91
  Urban 160 (82%) 2.16 (0.48–5.30)  
Ever drink maté, N (%) No 45 (23%) 1.02 (0.05–2.03) 0.0004
  Yes 154 (77%) 2.70 (0.89–6.92)  
Maté quartile 1 <100 mls/day 53 (27%) 1.01 (0.05–2.16) 0.0001
Maté quartile 2 >100 mls/day 66 (33%) 1.97 (0.33–5.58)  
Maté quartile 3 >500 mls/day 38 (19%) 3.24 (1.40–8.15)  
Maté quartile 4 >1000 mls/day 42 (21%) 4.06 (1.21–8.50)  
Current tobacco smoker, N (%) No 103 (52%) 1.14 (0.05–3.17) <0.0001
  Yes 96 (48%) 3.76 (1.52–8.57)  
Ever regular tobacco smoker, N (%) No 71 (36%) 1.14 (0.05–2.35) <0.0001
  Yes 128 (64%) 3.41 (1.09–7.88)  
Urine cotinine, N (%) 0 (<1–10 ng/mL) 49 (25%) 0.89 (0.05–2.35) <0.0001
  1 (10–30) 41 (21%) 1.52 (0.05–4.00)  
  2,3,4 (30–500) 39 (20%) 1.40 (0.29–3.68)  
  5 (500–2000) 36 (18%) 4.89 (1.74–8.69)  
  6 (>2000) 34 (17%) 7.36 (2.66–7.36)  
Smoke Exposure2 No 85 (43%) 1.14 (0.051–3.17) <0.0001
  Yes 114 (57%) 3.30 (1.40–8.15)  
Ever prepare BBQ, N (%) No 107 (54%) 2.03 (0.08–5.58) 0.31
  Yes 92 (46%) 2.136 (0.92–6.22)  
Prepared BBQ in the last week, N (%) No 148 (74%) 2.09 (0.31–5.60) 0.63
  Yes 51 (26%) 2.09 (0.76–6.60)  
Prepare BBQ at least once a week, N (%) No 145 (73%) 2.22 (0.33–5.84) 0.88
  Yes 54 (27%) 1.94 (0.95–5.90)  
Ever eat BBQ well done, N (%) No 56 (28%) 2.09 (0.24–7.52) 0.82
  Yes 143 (72%) 2.09 (0.57–5.58)  
Ever drink beer, N (%) No 126 (63%) 2.44 (0.30–6.92) 0.92
  Yes 73 (37%) 2.03 (1.02–4.63)  
Ever drink wine, N (%) No 168 (84%) 2.22 (0.05–6.66) 0.62
  Yes 31 (16%) 1.97 (1.27–3.30)  
Ever drink cachaca, N (%) No 165 (83%) 1.97 (0.33–5.39) 0.03
  Yes 34 (17%) 3.46 (1.52–8.19)  
  1. [1] All P-values come from the Wilcoxon rank sum test and the two-sided normal approximation P, except cotinine and mate quartile p-values which came from the Kruskal-Wallis test.
  2. [2] We defined smoke exposed subjects as subjects who are current tobacco smokers or have a cotinine value greater than category 1 (> 30 ng/mL).