Parkinson's Disease vs Alzheimer's Disease: tau-p181 (Plasma and Serum)


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Meta-analysis showed that levels of tau-p181 in the plasma of people with Parkinson's disease are approximately 60 percent those of people with Alzheimer's disease (effect size = 0.612). Although only three eligible comparisons contributed to the meta-analysis, the p value was highly significant (<0.0001) and the findings were consistent across studies. For comparison, the level of tau-p181 in control subjects is about half that in AD patients.

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How to interpret a forest plot: Each individual effect size (ES) is a ratio of the mean biomarker level in one condition over the mean level in another condition. An ES equal to 1 means that the two conditions had identical mean values. An ES > 1 indicates higher levels in the first condition, whereas an ES < 1 indicates lower levels in the first condition. The overall ES, indicated by a black diamond, is a weighted average of the individual effect sizes. The weight of each data point was determined by the inverse of the variance and is reflected in the size of each square. The width of the overall ES diamond is determined by the 95 percent confidence interval. Data out of range of the scale, including ES and confidence intervals, are indicated by an arrowhead at the edge of the plot, when applicable. 

Version 3.0, July 2021.