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. 2020 Feb 19;7(1):e000452. doi: 10.1136/bmjresp-2019-000452

Figure 2.

Figure 2

Correlation between total metals and cotinine, metallothionein and total metals, 8-OHdG and cotinine, and 8-OHdG and total metals in urine. (A–C) Linear regression analysis comparing total metal (µg/g of creatinine) and cotinine concentration (ng/mg of creatinine) in urine of the non-smokers, cigarette smokers and electronic cigarette user groups. (D–F) Linear regression analysis comparing metallothionein concentration (pg/mg of creatinine) and total metal concentration (µg/g of creatinine) in urine in the non-smokers, cigarette smokers and electronic cigarette users groups. (G–I) Linear regression analysis comparing 8-OHdG (ng/mg of creatinine) and cotinine (ng/mg of creatinine) concentration in urine of the non-smokers, cigarette smokers and electronic cigarette user groups. (J–L) Linear regression analysis comparing 8-OHdG (ng/mg of creatinine) and total metal (µg/g of creatinine) concentration in urine of the non-smokers, cigarette smokers and electronic cigarette user groups. N/A=not applicable since levels of cotinine in non-smokers was negligible.