Table V.

The calculated parameters of biological variation including the analytical acceptability index (A_I), index of individuality (I_I), index of heterogeneity (_IH) and the critical difference between serial results (CD).

Analyte	AI	II	IH	Analytical performance	CD	k
Vitamins and micronutrients
Retinol	0.69	0.32	0.26	Minimum	18.565	1.3
δ-Tocopherol	0.26	2.25	3.90	Desirable	15.315	2.9
γ-Tocopherol	0.16	0.69	0.60	Optimum	52.878	9.3
α-Tocopherol*	0.31	0.60	0.14	Desirable	18.565	2.5
Lutein	0.40	0.49	0.39	Desirable	30.272	2.0
β-Cryptoxanthine*	0.25	0.28	0.18	Desirable	35.263	1.2
β-Carotene*	0.74	1.92	0.49	Minimum	2.459	7.9
Lycopene*	0.38	0.69	1.17	Desirable	91.174	2.8
Vitamin C	0.32	0.97	0.87	Desirable	69.49	4.0
Lipids and lipid peroxides
TBARS*	0.54	1.00	1.12	Minimum	83.907	4.1
13-HODE	0.13	2.45	1.65	Optimum	149.230	3.7
9-HODE†	0.13	1.27	1.28	Optimum	115.008	5.2
13-HPODE*†	0.48	1.41	1.64	Desirable	124.603	5.8
9-HPODE†	0.15	1.39	2.43	Optimum	216.004	5.7
Linoleic acid*	1.04	0.36	0.00	Insufficient	0.132	1.5
Plasma AOX enzymes
pGPX	0.36	0.65	0.26	Desirable	20.573	2.7
Serum AOX enzymes
PONa	0.69	0.32	0.53	Minimum	42.437	1.9
PONp*	0.47	0.24	0.08	Desirable	6.27	1.0
Erythrocyte AOX enzymes
eSOD*	0.09	3.52	0.06	Optimum	5.961	14.5
eGSHR*	0.35	1.09	0.24	Desirable	18.854	4.5
eGPX*	0.43	0.50	0.09	Desirable	7.256	2.1

^*Log-transformed to improve the approximation to a normal.

^†Values reported below the limit of quantitiation. For definitions see footnote for Table II.