Compared to non-ICU patients, the ICU-patients were slightly younger, and more frequently males, more likely to report symptoms of fever, lower respiratory complaints, and loss of appetite (but less gastro-intestinal complaints), to suffer from pre-existing conditions (particularly obesity, arterial hypertension, and diabetes mellitus), and to present lower levels of lymphocyte and higher levels of LDH and CRP. Here, CRP is linked to Hypertension.