RESEARCH COMMUNICATIONS OF THE 28th ECVIM-CA CONGRESS

Five systolic blood pressure (SBP) measurements were obtained by the Doppler and oscillometric (with and without proprietary optimizations) devices and were averaged prior to statistical analysis. Bland Altman analysis was used to determine the agreement. The differences in SBP were plotted against the mean of each pair of measurement. The bias was defined by the mean differences between two methods. The precision was calculated from the standard deviation (SD) of the differences and limits of agreement was calculated from the bias ± 1.96 x SD. A paired sample T test was run to determine whether there was a statistically significant mean difference in the SBP measurement of the two methods. Overall statistical analysis was achieved using Excel with Minitab 17 Software. Comparison of the methods gave an average bias of +26.99 mmHg with 95% CI between 19.30 and 34.69 mmHg. The lower limit of agreement (LLA) was set at ‐11.13 mmHg and 65.12 for the upper limit of agreement (ULA); the difference between the upper and lower limit was 76.25 mmHg. Comparison produced an average bias of 20.83 mmHg with 95% CI between 14.85 and 26.81 mmHg. The limits of agreements were set at ‐8.80 for LLA and 50.45 ULA; the difference between LLA and ULA was 59.25 mmHg. As indicated by the bias, the oscillometry (with or without proprietary optimizations) overestimated the SBP. The mean difference between the two NIBP devices was significantly different.