(iii) Clinical variables
Hospitalized patients with WAS were identified with anInternational Classification of Disease – ninth revision (ICD-9) code of 279.12. Among these patients, those who underwent HCT were identified using ICD-9 diagnosis code of V4281 and DRG version 24 of 481. Data collected included patient age, sex, race, death during hospitalization, length of stay in days, elective admission, number of procedures, total charges for the admission, location of the patient and primary insurance status (Medicare, Medicaid, Private Insurance and Self-pay). All ICD-9 codes listed under diagnosis were reviewed to identify complications associated with WAS and complications associated with HCT.