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  • Title: Day-to-day intraindividual reliability and interindividual differences in monoamines excretion.
    Author: Curtin F, Walker JP, Schulz P.
    Journal: J Affect Disord; 1996 Jun 05; 38(2-3):173-8. PubMed ID: 8791186.
    Abstract:
    The urine of 44 normal men was collected during 2 nights to evaluate components of biological variation, i.e., intraindividual day-to-day variability and interindividual variability in monoamines excretion. Monoamines presented important interindividual variability [interindividual coefficients of variation (%): dopamine 18.3, norepinephrine 66.7, epinephrine 85.3, normetanephrine 22.4, metanephrine 76.8, 3-methoxy-4-hydroxyphenylglycol (MHPG) 77.0, vanilmandelic acid (VMA) 64.3, homovanilic acid (HVA) 71.3, 5-hydroxyindolacetic acid (5-HIAA) 20.4]. The reliability of these amounts was high, with intraclass correlation coefficients ranging from 0.43 (P < 0.001) for MHPG free form to 0.65 (P < 10(-6)) for dopamine and normetanephrine (intraindividual coefficients of variation (%): dopamine 8.5, norepinephrine 39.9, epinephrine 45.9, normetanephrine 10.3, metanephrine 46.3, MHPG 37.5, VMA 30.7, HVA 41.0, 5-HIAA 12.3).
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