Key result
Clinical tolerance limits provide a robust alternative to Bland-Altman for assessing BP measurement agreement.
Why the study?
New blood pressure measurement methods provide varying readings, requiring clinicians to assess agreement, yet conventional Bland-Altman methods require comparing Bland-Altman limits with prespecified clinical tolerance limits.
Proposes a simple and robust alternative to the Bland-Altman method for assessing clinical agreement between blood pressure measurement methods using clinical tolerance limits.
May simplify BP device agreement checks in practice; leaves open validation against Bland-Altman in prospective studies.
A large number of new methods of measuring blood pressure (BP) have recently emerged with advances in technology. Different methods of measuring BP generally provide varying readings compared with one another. Clinicians must decide how to respond to these variations and how to assess the degree of agreement. Clinical agreement between two quantitative measurements on a group of subjects is generally assessed with the Bland-Altman method. This method requires a comparison of Bland-Altman limits with the prespecified clinical tolerance limits. This review describes an alternative simple and robust method that directly uses clinical tolerance limits for assessing agreement without calculating Bland-Altman limits. The many advantages of this method are illustrated with the help of real-life examples of BP measurements.
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Abhaya Indrayan (2023) conducted a review in Blood pressure measurement. Direct use of clinical tolerance limits vs. Bland-Altman method was evaluated on Degree of agreement between two methods of measuring blood pressure. Direct use of clinical tolerance limits provides a simple and robust alternative to the Bland-Altman method for assessing agreement between blood pressure measurement methods.
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