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Percent change in plasma copeptin (a) and oxytocin levels (b) upon hypertonic saline infusion test. The middle line represents the median, the outer lines of the box the interquartile range (IQR). The lines between basal and stimulated hormonal levels indicate each individual participant. A percent change of 0% refers to the same basal and stimulated level, values >0% refer to an increase and values >0% refer to a decrease in stimulated hormone levels in reference to the basal level.
