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. 2021 Jul 18;33(6):1052–1068. doi: 10.1177/10406387211031194

Figure 5.

Figure 5.

Bland–Altman comparison for the interlaboratory canine urine cortisol comparison study (n = 11), with simple linear regression of the differences between laboratories. TVMDL used the Immulite 2000 Xpi cortisol immunoassay, and AHDC-CU used the Immulite 1000 cortisol immunoassay. There was one freeze–thaw cycle for AHDC-CU; there was none for TVMDL. The simple linear regression of the difference followed the equation: y = –0.1834x + 2.1856. Thus, and in light of the regression curve, there was a small positive constant bias most visible at low concentration, and a small negative proportional bias at higher concentration; none would significantly impact clinical interpretation. AHDC-CU = Animal Health Diagnostic Center of Cornell University; TVMDL = Texas A&M Veterinary Medical Diagnostic Laboratory.