Results
There were 181 patients who were diagnosed with ADR and 348 ADR
negative. The vast majority of the patients scored “Possible” on both
Liverpool assessment tool (480/529) (Table 2.) and Naranjo scale
(415/529) (Table 1.). No patient scored “Definite” on the Naranjo
Scale whereas 31 patients scored “Definite” on the Liverpool tool.
When both Naranjo scale and Liverpool assessment tool were correlated
with investigations used to diagnose ADR, both tools showed high
sensitivity but low specificity. The Liverpool tool had the higher
sensitivity at 97.2% ± 2.4% compared to Naranjo scale’s 81.2% ±
5.69%. The specificities for both tests were low at 2.3% ± 1.57% and
13.2% ± 3.56% for Liverpool and Naranjo, respectively.
Positive predictive values for Liverpool and Naranjo were similar at
34.1% and 32.7%, respectively. The negative predictive values were
also similar but higher for assessment tools at 61.5% for Liverpool and
57.5% for Naranjo.