Anecdotally, my father-in-law was chief of staff for a small city hospital and they had a rule about not scheduling afternoon surgeries on important days like anniversaries, birthdays, etc. Basically, if the surgery started going long, you didn't want the surgeon worrying about missing their spouses birthday, birthday with their kids or an anniversary. It actually wasn't that many surgeries delayed, as the surgeon ju…
This is a beautiful conjecture! The problem is amusingly circular. Even if you reject the conjure in parent comment, you will be tempted to reduce the number of birthday surgeries due to the increased mortality. This will mean that birthday surgeries are only done in even more desperate circumstances which of course will increase the risk. So mitigation of this problem will lead to the percentage increasing even more…
It is not even clear that there actually is a problem. It's just a weird way to slice the data to produce an effect.