Fig. 1.
Receiver operating characteristic curve illustrating the predictive value of age, sex and UPSIT score for amyloid status. Area under the curve for age and sex alone, 0.517 (95% confidence interval: 0.444–0.590), versus 0.545 (95% confidence interval 0.465–0.624) when UPSIT score is added to the model p = 0.466). This indicates that the addition of UPSIT score has very limited additional discriminatory value to predict amyloid status