Abnormal Olfaction in Parkinson’s Disease Is Related to Faster Disease Progression

Table 2

Frequency of abnormal olfaction in PD patients according to disease duration and disease severity.

	Hoehn and Yahr stage		Chi-square test
	≤2.5	≥3
Disease duration: ≥5 years			0.003
B-SIT <20th percentile	52 (75%)	38 (97%)
Disease duration: ≥10 years			0.049
B-SIT <20th percentile	14 (74%)	21 (96%)