Table 2.

Passing-Bablok regression and Bland-Altman analytics of canine serum progesterone concentrations measured by two point-of-care analyzers (POC-1 and POC-2) and a reference chemiluminescent immunoassay (CLIA).

Comparison	N	t	Slope (95% CI)	Intercept (95% CI)	Mean bias (95% LOA)
POC-1 by CLIA	75	0.8594	1.42 (1.29–1.56)	−0.21 ng/mL (−0.57–0.03 ng/mL)	1.24 ng/mL (−2.59–5.07 ng/mL)
				−0.67 nmol/L (−1.81–0.10 nmol/L)	3.94 nmol/L (8.24–16.12 nmol/L)
POC-2 by CLIA	74	0.8790	1.54 (1.39–1.67)	−0.37 ng/mL (−0.70–0.08 ng/mL)	1.61 ng/mL (−2.90–6.13 ng/mL)
				−0.89 nmol/L (−2.29–0.51 nmol/L)	5.12 nmol/L (9.22–19.49 nmol/L)

CI, confidence interval; LOA, limits of agreement; N, sample number; t, correlation coefficient.