Secondly, some residual confounders, such as prostate cancer, physical activity, and hormone medication, may still affect the association between SII and testosterone. However, the outcome remains dependent on the anti-inflammatory effects of testosterone. However, men aged year have a normal gonadal function and rarely have metabolic diseases. Epidemiological surveys have shown that total testosterone in the blood is inversely related to obesity (29), and the prevalence of TD is up to 79% in obese individuals (30). Based on a previous study (20), latent variables confounding the correlation between the SII and serum total testosterone were considered in the multivariable models. The systemic immune-inflammation index (SII), A relatively novel inflammatory biomarker, is integrated with absolute blood counts of neutrophils, lymphocytes, and platelets (12). These findings reiterated that increased levels of pro-inflammatory cytokines may cause an increase in TD. Thus, we conducted a separate set of analyses examining relationship status (without sexual activity); these analyses are presented in Supplementary Appendix B. The number of colonies formed on the sample plates were compared to plates with unimpeded growth; the degree of immune function is thus termed "percent killing". Functional immune response was measured with an ex-vivo bacterial killing assay (Demas and Carlton, 2015; Demas et al., 2011), adapted for saliva (Muehlenbein et al., 2011). Specifically, we predicted that at mid-cycle, T would be immunosuppressive, temporarily down-regulating immune responses that could interfere with conception (e.g., inflammation).
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