Table 3. Relative bias of analysed serum steroid immunoassays calculated against the LC-MS/MS assay and quantitative results of corresponding weighted Deming regression.

Analyte, unit	RB% (CV%)*	Linearity (P)	Normality of residuals (P)
Aldosterone, nmol/L	71.22 (80.71)	0.211	0.890
Cortisol, µmol/L	- 31.14 (33.39)	0.237	0.110
DHEAS, µmol/L	47.88 (58.82)	0.630	0.087
Testosterone, nmol/L	20.81 (139.61)	0.462	0.009
Progesterone, nmol/L	114.76 (139.83)	0.209	0.645
OHP, nmol/L	136.96 (55.71)	0.305	0.682
*Relative bias (RB) was averaged over the complete concentration interval and represented together with the corresponding CV%. P < 0.05 was considered statistically significant. DHEAS - dehydroepiandrosterone sulfate. OHP - 17-hydroxyprogesterone.