Encephalitis cohort demographics, 2000–2010.

Abbreviations: SE = standard error; HIV/AIDS = Human Immunodeficiency Virus/Acquired Immunodeficiency Syndrome; HSV = Herpes Simplex Virus; VZV = Varicella Zoster Virus; HHV = Human Herpesvirus; NOS = not otherwise specified.a) Variables with >1% missing values were included as “missing” within the table. Missing sex (n = 113), primary payer (n = 75), and hospital location/teaching status (n = 200) were not shown.b) The Charlson Comorbidity Index is a weighted index based on the presence of 17 comorbid conditions. Each comorbid disease is assigned a weight from 1 to 6; the index is the sum of the weights for each comorbid condition and can range from 0 to 33. For the purposes of this study, mild was score = 0, moderate score = 1, and severe score ≥ 2.c) Comorbidities affecting greater than 2% of encephalitis hospitalizations are displayed in the table. Others included within the index are hemiplegia/paraplegia, peripheral vascular disease, dementia, peptic ulcer disease, mild liver disease, and moderate to severe liver disease.d) Diabetes was combined to include diabetes with and without complications; two separate conditions within the Charlson Comorbidity Index.Encephalitis cohort demographics, 2000–2010.