In a multivariable logistic regression analysis, older age, a shorter time to ROSC, comorbid use of corticosteroid therapy and high CRP levels on admission were independently associated with the presence of lymphopaenia on admission (Table 3); IHCA was not associated with the occurrence of lymphopenia (OR 1.741 [−3.032 to 49.710]; p = 0.083). Here, CRP is linked to lymphopenia.