I den tredje undersøgelse var den anslåede risiko for at et nyt demyeliniserende tilbagefald lavere hos de patienter, der fik Avonex, end hos de patienter, der fik placebo: med Avonex var risikoen for et nyt tilbagefald 21% i løbet af to år og 35% i løbet af tre år, mens risikoen med placebo var 39% i løbet af to år og 50% i løbet af tre år.
In the third study, the estimated risk of having a second attack of demyelination was lower in the patients taking Avonex than in the patients taking placebo: with Avonex, the risk was 21% in two years and 35% in three years, whereas the risk with placebo was 39% in two years and 50% in three years.