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Hourly plasma melatonin taken for 24 hours was compared to a 24 hour collection of urinary 6-sulfatoxymelatonin (6-SM). In all three groups there was a significant correlation with plasma melatonin and urinary 6-SM in A) Day Workers, B) Night Workers, and C) Alcohol Use Disorder (AD). Linear correlation was used to compare plasma and urinary melatonin.
