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The selected answer is a misunderstanding of the Norweian text.
"Klasseeffekter" a back-translation from English, that entred into Norwegian through university textbooks in statistics. I remember learning about in my first year of sociology.

Now here is a citations that shows what it means:
"However, there are possible quantitative differences among ACE inhibitors that may alter the overall therapeutic benefits for specific patient populations and indications. Equipotency in terms of clinical efficacy is difficult to determine. Since the concept of "class effect" is a term of convenience that has no universally accepted definition and subsequently should not form the basis for the practice of evidence-based medicine, untested drugs of a "class" should be considered to be unproven drugs."

My answer was based on a recent document which specificaly refered to this particular phrase, and after consulting with other experts, I was given to understand that all drugs/chemicals have a "classified effect" count, based upon their strength or efficacy, on their own, or when in combination with any other drug/chemical, and that this was its (the drug/chemical) "effect classification" or "Efficacy class".

So we are apparently at loggerheads here. But I agree with Mats Wiman, all we are trying to do is help.