Done, You concentrate on pool questions, but some scuba courses are not includes pool at all.
So question "HOW MANY pool sessions did you have during your initial scuba certification course?" should have also option - 0
I mean my all course was in open water starting from first lesson.
You raise an important point. All agencies that I know of have "confined water" requirements that are usually done in a pool. They can also be done in "confined open water," an area of open water that has pool-like conditions with respect to depth, clarity, and water movement. Many people did their "pool" sessions in such water, and it is not likely that the instructor explained that this is what was happening. It might be a good idea for the survey to explain that so that new divers are not confused.
If you did not do any sessions in either a pool or confined open water, then that should probably be an option as well. I suspect that would be pretty rare.