Figure 1.

Total RT scores of five odorants in PD patients and control subjects. Compared with controls or HY I patients, total RT scores were higher in HY II, III, and IV patients (F = 8.154 and P < 0.001 by one-way ANOVA).

Notes: *P < 0.01 by Ryan’s method among the PD subgroups of HY II, III, and IV, and the control group; ^†P< 0.01 by Ryan’s method between the HY I group and other HY groups.

Abbreviations: ANOVA, one-way analysis of variance; HY, Hoehn and Yale; PD, Parkinson’s disease; RT, recognition threshold.