For an article that I want to publish, I would like to report the results from a survey in a table format but I do not know if I should put Zero or just a blank space/dash (-) whenever the score/percentage is zero. I cannot find any requirements from the journal concerning this issue. I cannot find any articles from that journal that would help me with this issue. How should I proceed? Any ideas?
Use a zero. A dash or blank space could be misinterpreted as 'not applicable' or 'missing data'.
If there is no guidance from the journal, use your own judgement. Look at several versions. A table showing insignificant (i.e. zero) results could be "busy" if there are a lot, but otherwise just fine.
Choose a version that makes it as easy as possible for the reader to grasp the important results.
Among other things, consider what happens if the table gets split over multiple printed pages. Make sure that it is easy to see which result in the body matches with labels and such in the margins.
If you break any of the journal's rules accidentally, I'm pretty sure you will be asked for an alternate version. Reviewers may comment as well.
Use a zero if that is just the numerical answer. (E.g. Number of Nobel Prizes won by poster guest.) Use a dash or preferably something like "not applicable" or "not measured" (abbreviated) if that is more the case.
Note, I do use - in some PPT tables in a business setting. But, I don't think they are optimal in a technical report. Try to be more precise (but still terse). You are writing for archived technical literature and you want people to understand if the answer was zero or just not measured.