Fig. 4From: Evaluating the effect of aromatherapy on a stress marker in healthy subjectsWe examined the correlation between the rate of change in the salivary s-IgA level and that in the blood NA level (saliva and blood samples were collected on the same day). There was a weak correlation (regression formula: y = 0.12x + 0.80, R2 = 0.24)Back to article page