Table 2.

Comparisons of urinary levels of DNA/RNA oxidation products and 15-isoprostane F_2t among the tertile groups for urinary pteridines in multivariate analysis.

Variable	Pteridines
	1st tertile	2nd tertile	3rd tertile
Log(DNA/RNA oxidation products)	1.911 (1.877 to 1.945)	1.934 (1.901–1.967)	2.015 (1.981–2.050)**,††
Log(15-isoprostane F2t)	0.053 (− 0.008 to 0.114)	0.189 (0.130–0.249)**	0.227 (0.164–0.289)**

Means with their 95% confidence intervals in parentheses are shown. Age, history of smoking, BMI and eGFR were used as other explanatory variables in multivariate analysis.

Symbols denote significant differences from the 1st tertile (**p < 0.01) and 2nd tertile (^††p < 0.01) for pteridines.