Methods
This study is a retrospective review of all pediatric patient
(<18 years) electronic medical records who were diagnosed with
IH at large, tiertiary medical center in the United States between
August 2009 to July 2017. We adhered to the STROBE reporting guideline
to insure our study follows the standards for reporting observational
studies. Approval was obtained from our institutional review board with
a waiver of informed consent due to the retrospective nature of this
study. Patient demographics, IH clinical features, and treatment data
were extracted from the electronic medical record. Race and ethnicity,
self-reported in clinic intake forms, were gathered from the medical
record. All electronic medical record data collected during the course
of this research was stored within a secure REDCap database, using a
unique, encrypted identifier for each patient.
Descriptive statistics, including
percents and frequencies for categorical variables, are presented and
chi-square test was used for the comparison between groups. Logistic
regression was applied to identify risk factors for outcomes of interest
with the adjustment of location.