Hyposmia as a Predictive Marker of Parkinson’s Disease: A Systematic Review and Meta-Analysis

Figure 2

Forest plots of studies investigating the incidence of PD. (a) Subgroup analysis according to different hyposmia assessments. (b) Subgroup analysis according to different follow-up periods. UPSIT: the US version of the University of Pennsylvania Smell Identification Test; BSIT: the 12-item Brief Smell Identification Test; SDOIT: the San Diego Odor Identification Test.

(a)

(b)