Fasting EDTA plasma samples stored at 80 °C were used to measure concentrations of hsCRP using nephelometry on a BN II using reagents from Siemens (Eschborn, Germany) and IL-18 by Elisa technology using the IL-18 test kit from MBL (Nagoya, Japan). More details are previously published (Herder et al, 2013 (link)). Eighty-six participants were excluded from this analysis due to missing values; however, the number of participants with severe anxiety remained the same. Both, CRP and IL-18 concentrations were approximately lognormal distributed and therefore log-transformed to be used as continuous variables.