I have read the question Are there any guidelines for labeling axes in plots/graphs? and related answers and they cover the case where the unit is from the International System of Units (SI), but what about when the graph shows information about people?
I am interested in medicine or in psychology where a lot of graph are related to number of people, is there any wide adopted guideline?
What is the right word to use?
For example if
person were a unit of measurement I should write
10 person and not
10 persons because for SI units we do not use plural forms.
In the same way, in a axis label I should write
person and not
number of persons because we usually write
meter (if not abbreviated) and not
number of meters.
And then, what is the short form for
person? I see sometimes
pax but as a short form for
passenger of an aircraft.