Negative value indicates that the NIBP underestimated the IBP in that location, and a positive value indicates an overestimation.
Table 3. Mean and 95% confidence intervals (95% CI) of sensitivity, specificity, false positive and false negative rates of measuring mean arterial pressure (MAP) non-invasively via oscillometric technique (NIBP) on the tail with a cuff width-to-tail circumference ratio of 0.25 to detect hypotension in dorsally recumbent, anaesthetized horses. Calculations were made using either individual heart level corrections (A) or using a standardised 27 mmHg heart level correction (B, C, D). True hypotension was defined as MAP < 70 mmHg in the FA and the parameters were calculated for hypotension based on NIBP < 70 mmHg (A, B), < 80 mmHg (C) or < 90 mmHg (D). False positive rates indicate the percentage of normotensive (FA ≥ 70 mmHg) horses that would be considered hypotensive and hence treated based on NIBP readings. False negative rates indicate the percentage of truly hypotensive (FA < 70 mmHg) that would be considered normotensive and hence not be treated based on NIBP readings.