Ves-Matic Cube 200 vs. Test-1. We would like to compare the results of two papers recently issued on two international scientific journals :. Let’s start with Linear Regressions. Linear Regression is a way to study the strength of the correlation between two methods, not their agreement
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Wewouldliketo compare the resultsoftwopapersrecentlyissued on twointernationalscientificjournals:
By comparing the values it is clear that the Ves-Matic Cube correlates with the Westergren method better than the Test-1 (ρ = 0.946 compared with r2 = 0.386).
LET’S SHOW THE TRICK
Please note that in Figure 1 - Test-1 graph - there are points (left side of the Test-1 vs Westergren graph) which show that the Test-1 has provided either very high ESR values, which resulted normal or slightly high with Westergren method, and falsely low values (around 20 mm), while with the Westergren method they were high (over 40 mm). Consider that different ESR levels may have a different clinical significance and thus address clinical decisions to one or another direction
a graphic trick has been used to try and minimize the visual impact of the overestimation of ESR low values in the -Test-1/Westergren graph: point 20 has a different proportion on x and y axis (Figure 1 - Test-1 vs Westergren chart).