Using Bland-Altman to assess agreement between two medical devices--don't forget the confidence intervals!
The limits of agreement approach of Bland and Altman is by far the most popular method for investigating statistical agreement between two measurement devices. This work presents the dangers of relying exclusively on the limits of agreement alone and argues that authors should always provide confidence intervals to assess the variability in the estimated limits.
Hamilton
Cody
C
Edwards Lifesciences, One Edwards Way, Irvine, CA 92614, USA. Cody_Hamilton@Edwards.com
Stamey
James
J
D001786:Blood Glucose / Q000032:analysis; D016001:Confidence Intervals; D003627:Data Interpretation, Statistical; D006801:Humans; D015233:Models, Statistical; D008991:Monitoring, Physiologic / Q000706:statistics & numerical data*; D015588:Observer Variation; D012016:Reference Values; D015203:Reproducibility of Results; D012107:Research Design / Q000706:statistics & numerical data; D018709:Statistics, Nonparametric
D001786:Blood Glucose