When I was in medical school (1978-1982) and the first few years of residency, it was common to find coke cases used in the operating room. Being only 5 ft 3 in tall, I almost always needed at least one, and often two of these cases to stand on.
Checking online, the most common measurements for wooden coke cases were: 18" X 12" X 4-5" This made for a safe standing area. They were sturdy, even when stacked. These cases were used commonly in the 70’ when sodas were bottled in glass not cans.
When I became the “surgeon,” I got to chose the OR table height. No longer do I need to stand on a step stool. When I am working with someone much taller than I am, I will raise the table to a comfortable height for them and stand on a step stool. Doesn’t happen often these days.