Table 3.

Calibration curves and cross validation

Item	Extracted factors^a	R²	RMSECV^b	RER^c	RPD^d	S_r ^e	RSD_r ^f
Glucose, mmol L⁻¹	5	0.66	0.3893	11.7	1.7	0.1550	3.86
Total cholesterol, mmol L⁻¹	7	0.99	0.1156	43.8	13.8	0.0690	2.06
NEFA^g, mmol L⁻¹	6	0.86	0.1094	10.2	2.7	0.0325	9.80
NEFA^g, ln(mmol L⁻¹)	5	0.78	0.4414	6. 8	2.1	0.1214	7.99
BHBA^h, mmol L⁻¹	5	0.38	0.1012	5.6	1.3	0.0245	4.98
BHBA^h, ln(mmol L⁻¹)	7	0.60	0.1572	7.1	1.6	0.0669	9.03
Urea, mmol L⁻¹	6	0.90	0.4623	13.0	3.1	0.2454	5.83
Creatinine, μmol L⁻¹	4	0.60	6.7608	6.3	1.6	0.3080	0.31
Ca, mmol L⁻¹	3	0.60	0.0791	6.3	1.6	0.0048	0.19
Inorganig P, mmol L⁻¹	5	0.55	0.2336	7.3	1.5	0.0545	3.00
Mg, mmol L⁻¹	4	0.55	0.0701	7.8	1.5	0.0063	0.62
Na, mmol L⁻¹	4	0.57	2.2673	5.7	1.5	0.3289	0.23
K, mmol L⁻¹	2	0.10	0.1920	5.1	1.0	0.0043	0.11
Cl, mmol L⁻¹	6	0.70	1.3219	8.1	1.9	0.3198	0.30
Zn, μmol L⁻¹	4	0.49	1.9577	5.6	1.4	0.2240	1.96
Ceruloplasmin, μmol L⁻¹	3	0.59	0.6575	7.1	1.5	0.0705	2.17
Total protein, g L⁻¹	5	0.99	0.7452	31.3	8.4	0.1561	0.21
Albumin, g L⁻¹	6	0.96	0.5082	27.1	5.2	0.1362	0.38
Globulin, g L⁻¹	4	0.98	0.8128	29.6	7.8	0.2665	0.67
Total bilirubin, μmol L⁻¹	5	0.75	2.2967	9.7	2.0	0.6654	16.71
Total bilirubin, ln(μmol L⁻¹)	3	0.66	0.5320	8. 2	1.7	0.0225	2.40
Haptoglobin, g L⁻¹	4	0.62	0.1678	5.2	1.6	0.0148	5.97
Haptoglobin, ln(g L⁻¹)	4	0.66	0.5734	6.0	1.7	0.0494	2.59
ASTⁱ, U L⁻¹	6	0.69	39.5398	8.7	1.8	9.1112	8.54
ASTⁱ, ln(U L⁻¹)	4	0.54	0.2856	7.2	1.5	0.0282	0.62
GGT^l, U L⁻¹	4	0.40	7.5093	6.3	1.3	0.3565	1.27
GGT^l, ln(U L⁻¹)	3	0.42	0.2344	5.8	1.3	0.0154	0.46
AP^m, U L⁻¹	7	0.66	13.2962	6.2	1.7	8.3024	16.33
AP^m, ln(U L⁻¹)	7	0.64	0.2614	6.02	1.6	0.1696	4.42

^aNumber of extracted factors with the PLS procedure

^bRoot mean square error of cross validation

^cRange error ratio, obtained dividing the range of each variable by its standard deviation of prediction errors

^dRatio of prediction to deviation, obtained dividing the standard deviation of each variable with its standard deviation of prediction errors

^eRepeatability of the standard deviation

^fRepeatability relative standard deviation

^gNon esterified fatty acids

^hβ-OH-butyric acid

ⁱAspartate amino transferase

^lγ-glutamyl transferase

^mAlkaline phosphatase