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Spearman’s rank correlation coefficients of associations between urinary biomarkers of tobacco exposure, 8-OHdG, and m7Gua
| Variable | Correlation coefficients | |||
|---|---|---|---|---|
| Nicotine | Cotinine | NNAL | m7Gua | |
| Cotinine | 0.80** | – | – | – |
| NNAL | 0.61** | 0.66** | – | – |
| m7Gua | 0.16 | 0.26** | 0.35** | – |
| 8-OHdG | 0.04 | −0.06 | −0.02 | 0.22* |
* indicates p < 0.05. ** indicates p < 0.01
