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Median [interquartile range] salivary levels of leptin and ghrelin before the beginning of a day shift and at the end of a night shift. The results of leptin are expressed in nanograms per deciliter. Results of ghrelin are expressed in picogram per milliliter. Ng = nanogram, pg = picogram, dL = deciliter, mL = milliliter, NS = not significant, n = number of samples studied, SD = standard deviation, IQR = interquartile range.
