ACR- N anvender de samme kriterier som ACR20, beregnet ved at tage den laveste procentvise forbedring i antallet af hævede led, antallet af ømme led og medianen af de sidste 5 komponenter af ACR responset.
ACR-N uses the same criteria as the ACR20, calculated by taking the lowest percent improvement in swollen joint count, tender joint count, and the median of the remaining 5 components of the ACR response.