Table 5.

Pearson (r) Correlation Coefficients Between 24 h 8-oxodG Excretion and 8-oxodG Levels

	8-OxodG Levels
Sample collection time	nmol/h	nmol/mmol creatinine	nM-SG 1.018
First morning (FM)	0.90	0.60	0.59
FM–09.30	0.80	0.48	0.68
09.30–12.00	0.83	0.43	0.47
12.00–14.30	0.67	0.57	0.63
14.30–17.30	0.80	0.55	0.59
17.30–22.00	0.76	0.59	0.58

Results determined by UHPLC-MS/MS (Laboratory 9), were expressed as (i) excretion rate (nmol/h), or adjusted for (ii) creatinine (nmol/mmol creatinine), or (iii) specific gravity (nM-SG; standard SG=1.018) in timed spot urine samples within the same day (day “A”) in 26 volunteers. All correlation coefficients are statistically significant (p<0.05).