Table 4.

Comparison between actual and estimated plasma concentrations by means of Passing–Bablok regression, Bland–Altman, and Lin’s concordance correlation coefficient (Lin’s CCC) analyses.

Analyte	Passing–Bablok Regression				Lin’s CCC	Bland–Altman Analysis
	Slope	95% CI	Intercept	95% CI		Bias	95% CI	ρ	p-Value
letrozole	1.0	0.9 to 1.1	0.9	−5.7 to 8.5	0.9901	−0.6	−4.2 to 2.9	−0.045	0.844
abemaciclib	0.9	0.8 to 1.1	5.0	−7.1 to 17.8	0.9444	−6.2	−18.3 to 5.8	−0.208	0.380
M2	0.8	0.7 to 1.1	9.0	−1.7 to 17.0	0.8850	−3.0	−9.4 to 3.3	−0.322	0.166
M20	0.9	0.8 to 1.1	4.2	−4.4 to 18.1	0.9743	−2.0	−7.1 to 3.2	−0.272	0.246