[Compensation graph method of group representation of statistically processed results of an acid-base equilibrium...

A graphic method was worked out for representing the statistical processed results of the determination of blood pH, pCO2, and base excess in a group of animals subjected to a metabolic test. The method is based on the determination of a selective mean and 95% confidence interval of the selective mean of the above-mentioned parameters in a group of animals; these mean values and confidence intervals are then plotted in a compensation graph. The area delimited in the graph by the upper and lower limits of the 95% confidence intervals of the selective means includes the mean values of the basic population with the probability of 94.7375%. The position of the plotted individual acid-base balance values of 422 animals, compared with the 60 areas delimited by the 95% confidence intervals of the selective means for the groups of animals, showed a very good correspondence in 91.23% of cases and partial correspondence in 8.74% of cases.