Comparison of Blood Pressure Machines

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Abstract
After examining published papers and our own experiences we suggest some simple guidelines for future studies which compare sphygmomanometers. The sample should be stratified to cover a wide range of blood pressures. Observers should measure pressures using a balanced cross-over design under standard conditions. Data should be shown on a scatterplot to allow visual estimation of bias, variability of readings and non-linear relationships. Statistical analyses if universally applied would allow comparison of studies. We suggest the use of the following common methods; the mean of the differences between paired readings with standard deviation, linear regression with both zero and non-zero intercepts and analysis of variance.

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