Naranjo ADR probability score Yongqun He a score of the Naranjo adverse drug reaction probability scaling SCORING: ≥9 = definite; 5–8 = probable; 1–4 = possible; ≤0 = doubtful WEB: http://livertox.nih.gov/Narajo.html Naranjo CA, Busto U, Sellers EM et al. (1981). "A method for estimating the probability of adverse drug reactions". Clin. Pharmacol. Ther. 30 (2): 239–45. doi:10.1038/clpt.1981.154. PMID 7249508. adverse event causality score causality based on Naranjo ADR probability scale