Fig. 2
From: Burden of influenza hospitalization among high-risk groups in the United States
Number of baseline AHRQ/CDC comorbidities by influenza-related hospitalization status. AHRQ: Agency for Health Research and Quality, CDC: Centers for Disease Control and Prevention. *Patients could have a maximum of 37 comorbidities defined using ICD-9/ICD-10 codes from the Elixhauser Comorbidity Software (AHRQ) and groups defined by the CDC as at high-risk for influenza-related hospitalizations