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Table 3 Classification of statistical methods used to compare image-guided vital signs measurement against reference device

From: Availability and performance of image/video-based vital signs monitoring methods: a systematic review protocol

Gold standard Acceptable Inappropriate
 • Bland-Altman plot/limits of agreement (LOA) analysis  • Intraclass correlation coefficient  • Lin’s concordance correlation coefficient  • British standards reproducibility/repeatability coefficient For all methods in this category, if repeat measurements per patient have not obviously been accounted for, then classify as acceptable. • Mean square error/deviation • Root mean square error/deviation • Mean absolute error/deviation • Accuracy • Categorisation (e.g. proportion of time/measurements test within a threshold of gold standard) • Descriptive only—plot of test against gold standard, or test and gold standard signals overlaid • (Pearson’s) correlation coefficient • T test