Table 3.

Passing–Bablok regression and concordance correlation analysis for each immunoassay against LC-MS/MS total or 25(OH)D₂

	Passing–Bablok regression						Concordance correlation
	Intercept	95%CI	Slope	95%CI	Cusum test		CCC	95%CI	r	Cb
Before-Centaur	16.9	10.8 to 22.1	0.48	0.34 to 0.65	p>0.05		0.43	0.25 to 0.58	0.52	0.83
Before-Elecsys	−5.3	−19.4 to 3.6	1.12	0.87 to 1.47	p>0.05		0.69	0.52 to 0.80	0.69	0.99
After-Centaur	−13.8	4.4 to 19.8	0.53	0.42 to 0.73	p>0.05		0.39	0.25 to 0.51	0.68	0.58
After-Elecsys	13.8	−22.9 to 1.9	1	0.78 to 1.22	p>0.05		0.61	0.45 to 0.73	0.75	0.81
Adjusted 25(OH)D2
Centaur	−8.4	−13.1 to −3.7	1.05	0.73 to 1.50	p>0.05		0.34	0.17 to 0.49	0.54	0.63
Elecsys	−19.1	−30.8 to 10.9	1.54	1.07 to 2.50	p>0.05		0.26	0.09 to 0.42	0.41	0.64

CCC, concordance correlation coefficient; CI, confidence interval; r, Pearson’s correlation coefficient; Cb, bias correction factor; Before-Centaur, Centaur values before treatment; Before-Elecsys, Elecsys values before treatment; After-Centaur, Centaur values after treatment; After-Elecsys, Elecsys values after treatment.