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Table 4 Results of 4-quadrant plot and polar plot

From: A preliminary study evaluating cardiac output measurement using Pressure Recording Analytical Method (PRAM) in anaesthetized dogs

  TDCO vs PRAMCO
Measurements < 10% (n) 11
Measurements > 10% in the right quadrants (n) 34
Measurements > 10% in the wrong quadrants (n) 3
Total measurements > 10% (n) 37
Concordance rate (%) 92
Mean angular bias (°) 3.9
Radial limits of agreement (°) ± 12.1
  1. Concordance rate was calculated as: 100 × (data points in correct quadrant and > 10% CO)/data points > 10% CO. Concordance rates are considered to be good when above 95%, acceptable when between 90 and 95% and poor when below 90%. In the polar plot a mean angle with the horizontal axis < 5° and radial limits of agreement RLOA (= 95% confidence interval) < 30° are considered to indicate good trending ability