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. 2012 May 21;7(5):e37412. doi: 10.1371/journal.pone.0037412

Table 3. Concentrations of urinary 1-OHPG, 8-OHdG and DNA strand breaks in the exposed and reference groups by order of day.

	Exposed group					Reference group
Variables	1^st day		2^nd day		p-value^a	1^st day		2^nd day		p-value^b	p-value^c	p-value^d
	Median(Q₂₅-Q₇₅)	N	Median(Q₂₅-Q₇₅)	N		Median(Q₂₅-Q₇₅)	N	Median(Q₂₅-Q₇₅)	N
Biomarker of exposure
Urinary 1-OHPG (µg/g creatinine)	0.36 (0.21–0.58)	83	0.33 (0.17–0.55)	81	0.393	0.16 (0.08–0.23)	47	0.18 (0.11–0.31)	46	0.634	<0.001	0.001
Biomarkers of effect
Urinary 8-OHdG (µg/g creatinine)	3.67 (2.72–5.01)	87	3.44 (2.66–4.30)	83	0.494	2.53 (1.58–3.59)	47	2.28 (1.53–3.50)	46	0.133	<0.001	<0.001
DNA strand breaks (%)	14.95 (12.65–18.53)	89	15.37 (12.85–19.63)	82	0.314	9.26 (7.64–10.62)	49	9.46 (8.02–11.20)	47	0.536	<0.001	<0.001

^a

Wilcoxon Signed rank test within exposed group.

^b

Wilcoxon Signed rank test within reference group.

^c

Mann-Whitney U test between exposed and reference group for the first day.

^d

Mann-Whitney U test between exposed and reference group for the second day.