We compared around 3,000 anonymized breathalyzer data points from March 17-18, 2023 with typical turnouts for select, major St. Patrick's Day parades (both spectators and participants) across the country, and the number of residents of Irish descent within each state.
On its own, the correlation is weak between Irish population and BAC level on St. Patrick's Day. But Irish population (unsurprisingly) strongly correlates with St. Patrick's Day parade size - and St. Patrick's Day Parade size correlates significantly with holiday BAC levels.
So, does Irish population size affect St. Patrick's Day drinking more than the numbers imply?
(And, side note: If you're attending a parade, take it easy!)