FGF23 and infection: After adjusting for the infectious status and CRP in multivariate linear regression analysis, i-FGF23 was not correlated any more with hepcidin [standardized coefficient −0.037, 95% confidence interval [CI] (−0.13, 0.05), p = 0.412], whereas the absence of infection was the only factor strongly correlated with i-FGF23 [standardized coefficient 11.45, 95% CI (1.97, 20.93), p = 0.019] (Table 5).