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. 2023 Nov 17;81(1):183–192. doi: 10.1161/HYPERTENSIONAHA.123.21618

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© 2023 The Authors.

Hypertension is published on behalf of the American Heart Association, Inc., by Wolters Kluwer Health, Inc. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution, and reproduction in any medium, provided that the original work is properly cited.

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Figure. — Measurement error (m/s) for which the probability of observing such error or less is 85% (numbers on colored background). Colors (device validation outcome): green: good (error ≤1.0 m/s); orange: acceptable (error ≤1.5 m/s); and red: fail (error >1.5 m/s). Before looking up a combination of mean and SD, round up both values to 0.05-m/s precision (eg, 0.41 m/s is rounded to 0.45 m/s; 0.47 m/s is rounded to 0.50 m/s). For example, a mean difference of 0.36 m/s (rounded to 0.40 m/s) and an SD of that difference of 0.44 m/s (rounded to 0.45 m/s) correspond to an error of 0.88 m/s. This implies that, on average, 85% of the validation measurements are within ±0.88 m/s of the reference measurement. Because 0.88≤1.0 m/s, this device passes validation with good accuracy.