Fig. 1From: Diurnal variation of salivary oxidative stress marker 8-hydroxyguanineDiurnal variation of salivary 8-OHGua levels for each subject. a: 40s female, b: 60s female, c: 20s male, d: 30s male, e: 50s male, f: 60s male. Bars are mean ± SE, n: number of saliva collections, *p < 0.05, **p < 0.01, by Friedman testBack to article page