National trends of psoriasis hospitalizations: a 2-decade longitudinal United States population based study.

The incidence of psoriasis (PsO) increased between 1970 to 2000 in the United States (U.S).1 Therapies for moderate-to-severe PsO and psoriatic arthritis (PsA) have experienced advances due to biologic agents' introduction in the early 2000s.2 We aim to study longitudinal trends of PsO hospitalizations in the last 2 decades in the U.S, following biologic agents' introduction. Data was obtained from the National Inpatient Sample (NIS) database, the largest hospitalization database in the U.S. NIS is a nationally representative stratified sample of 20% of all hospitalizations in the US. We performed a 21-year longitudinal trend analysis of NIS 1998-2018.