Table 2 Logistic regression analysis of log10-transformed blood furan levels for the risk of COPD

Log10-transformed blood furan

6.00 (3.58–10.05)

< 0.001

3.14 (1.64–5.99)

< 0.001

4.70 (1.58–13.94)

0.007

Q1 group

Reference

Reference

Reference

Q2 group

1.75 (0.78–3.89)

0.168

1.40 (0.61–3.22)

0.417

2.09 (0.70–6.28)

0.181

Q3 group

2.29 (1.32–3.99)

0.004

1.54 (0.85–2.80)

0.147

3.10 (1.29–7.41)

0.013

Q4 group

2.50 (1.32–4.74)

0.006

1.54 (0.75–3.14)

0.230

3.03 (1.13–8.08)

0.028

Q5 group

6.11 (3.71–10.05)

< 0.001

3.35 (1.85–6.07)

< 0.001

4.47 (1.58–12.66)

0.006

P for trend

< 0.001

< 0.001

0.001