Fig. 5: Influence of distractors in multiple-choice smell tests for five shared scents selected. | npj Parkinson's Disease

Fig. 5: Influence of distractors in multiple-choice smell tests for five shared scents selected.

From: Development of a simplified smell test to identify Parkinson’s disease using multiple cohorts, machine learning and item response theory

Fig. 5

Panels with odd numbers show the Item Characteristic Curves (ICCs) of five SST-ID scents: mint, licorice, banana, orange, and lemon. Panels with even numbers show ICCs of the corresponding UPSIT scents. In each figure, panels on the left show data for PD/DLB patients, panels on the right for healthy controls (HC). The x-axis reveals transformed score indices in [0,100] (percentage rank of the respective scores) within the corresponding group. The y-axis shows the probability of choosing each option at a particular score index. The correct option of each item is highlighted using thicker, blue curves. Numbers in the color legends represent option indices. The horizontal dashed lines represent 50% probability. The vertical dashed lines represent five quantiles (5%, 25%, 50%, 75%, and 95%).

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