Two methods are available to assess the concordance between measurements of a continuous variable through observers, instruments, dates, etc. One of them, the intraclass correlation coefficient (ICC), provides a single measure of the magnitude of the concordance, and the other, the Bland Altman diagram, provides a quantitative estimate of the proximity of the values of two measures. Consider a situation in which we would like to evaluate the adequacy between hemoglobin measurements (in g/dl) with a hemoglobinometer on the hospital bed and the formal photometric laboratory technique in ten people [Table 3]. The Bland Altman diagram for this data shows the difference between the two methods for each person [Figure 1]. The mean difference between the values is 1.07 g/dl (with a standard deviation of 0.36 g/dL) and the 95% match limits are 0.35 to 1.79. .
17 September 2021 BBP Admin Uncategorized
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