Any experts in levels of evidence out there?

[AusNurse2B]

The NMHRC's Levels of evidence is doing my head in!! I need to find out if there is an easy way of telling what LOE an article is.... I look at it once and think, yeah level III-2 then the next time it could be III-3, but I need to get it right!

So, I have a research paper that conducted a questionnaire and compared results to the rest of the world at other times. I am assuming this would be a level III-3 - Evidence obtained from comparative studies with historical

control, two or more single arm studies, or interrupted time

series without a parallel control group. But it could be a III-2 Evidence obtained from comparative studies (including systematic reviews of such studies) with concurrent controls and allocation not randomised, cohort studies, case-control studies, or interrupted time series with a control group.

Does anyone know about LOE??

Thanks