Influence of Different Cut-Off Values on the Diagnosis of Mild Cognitive Impairment in Parkinson's Disease

Table 2

Percentage (including 95% confidence interval, 95% CI) of Parkinson patients with minimal cognitive impairment (PD-MCI) and without (PD-noMCI) in regard to varying cut-off values.

	PD-noMCI			PD-MCI
	N	%	95% CI	N	%	95% CI
One test per domain below cut-off
𝑧<−1	8	7.9	3.7–15.5	93	92.1	84.5–96.2
𝑧<−1.5	28	27.7	19.5–37.7	73	72.3	62.3–80.5
𝑧<−2	67	66.7	56.2–75.3	34	33.7	25.2–43.3
Two tests per domain below cut-off
𝑧<−1	44	43.6	33.8–53.9	57	56.4	46.2–66.2
𝑧<−1.5	70	69.3	59.3–77.9	31	30.7	22.1–40.8
𝑧<−2	91	90.1	82.1–94.9	10	9.9	5.1–17.9