The linear range and the R² for the detection.

Sample	Compound	Linear range	Equation	R 2
Plasma	MDEA	1.0–1000 ng mL	y = 0.1892x − 3.0031	0.994
	EDEA	1.0–1000 ng mL	y = 0.1483x − 0.6669	0.998
	TEA	1.0–1000 ng mL	y = 0.1573x − 3.3421	0.994
Urine	MDEA	1.0–1000 ng mL	y = 0.0751x + 2.1797	0.997
	EDEA	1.0–1000 ng mL	y = 0.0646x − 0.1120	0.998
	TEA	1.0–1000 ng mL	y = 0.0616x + 0.2562	0.997