I don't have a report history or the amount which is good, bad or unhandled so I don't think it's ranked based. I've made a very small amount of reports though so I'm guessing the more in depth stats become available once you've reported over a certain amount of posts.
Users who didn't made a report in the last 30 days, normally couldn't find anything in their history.
If you mean that you have for example less than 10 reports and you couldn't see how many are good/bad/unhandled then probably you are right about the minimum requirement (even if i don't understand the reason behind it)
Edit : @thequin & welsh : yeah probably.