Head-to-head comparison of three stool calprotectin tests for home use
Fig 2
Bland-Altman plots showing difference against mean for (A) IBDoc vs. fCAL; (B) QuantOn Cal vs. IDK Calprotectin; and (C) CalproSmart vs. Calprotectin (ALP).
The grey zone corresponds with the predefined acceptable limits of difference, which were arbitrary set at ±100 μg/g for the lower range and at ±200 μg/g for the higher range.[7] The dotted line is the bias (mean of the differences), the dashed lines are the upper and lower 95% limits of agreement (LOA).