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Bland Altman difference plot indicating agreement between G.A.B.R.I and classic tests. The mean difference is −282.1 percentage points with 95% confidence interval −377.8 to −186.5 (Standard Deviation = 350.6). The limits of agreement are: Upper agreement limit = 419.1 (95% CI: 253.3 - 584.8 ) and Lower agreement limit = −983.3 (95% CI: -1149.1 - -817.6 ).
