Median is better here. Average wait includes homeless people who use the waiting room for a warm nights sleep and similar outliers. They quickly get triaged and a free sandwich
Not so sure the median would be so far off here. Just earlier this week I spent about 4.5 hours in the ER in a Bay Area hospital. Not DC, but 5.5 hours doesn’t seem crazy to me.
The average ER wait time across DC was 5 hours and 29 minutes. That's across all hospitals.