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bd40bc7c7a Reference values for adult men are currently provided by the manufacturers (IMMULITE 2500 DHEA-SO4, 2004), who quote only the 5th and 95th percentiles, and a German study (Elmlinger et al, 2003), which also measured serum DHEAS levels with the IMMULITE system and determined the central 95% range. Nevertheless, the comparison of the immunoassays used with mass spectrometry demonstrated that automated immunoassays are capable of distinguishing eugonadal from hypogonadal males. Soz Praventivmed. Endocrine alterations in the aging male. Recent advances in quantile regression models: a practical guideline for empirical research. Obst, B. Ann N Y Acad Sci. Schurmann, G. In addition, all medications taken in the last 7 days were recorded and categorized in a standardized fashion using the Anatomical Therapeutic Chemical (ATC) classification index, which classifies drugs on the basis of the target organ or system and on the therapeutic and chemical characteristics of the drug (Fricke and Gntler, 2002).
Gloger, A. Glaser, R. Age-related changes of serum sex hormones, insulin-like growth factor-1 and sex-hormone binding globulin levels in men: cross-sectional data from a healthy male cohort. Gamma-glutamyl transferase (GGT), aspartate aminotransferase (ASAT), and alanine aminotransferase (ALAT) levels were measured photometrically (Hitachi 717). 1987;83: 853–859. New York, NY: Cambridge University Press; 2005. Linear regression models for mean serum testosterone levels and after initial transformation for mean serum DHEAS levels were fitted (Table 3). IMMULITE 1000 Immunoassay System . For the evaluation of reference values of serum DHEAS and testosterone levels we performed 2 statistical approaches: 1) linear regression and the mean 1.96 SD concept and 2) quantile regression, a statistical method for estimating models for the conditional median function and other conditional quantile functions (Koenker, 2005). 1981;57: 69–73.