Table 4.

Effect of creatinine correction in the variance apportionment for the urinary concentrations of MEP and MEHHP in spot samples collected from eight persons over a period of 7 days.

	Creatinine unadjusted		Creatinine corrected		Creatinine as a covariate
	Variance component	Percentage of total variance	Variance component	Percentage of total variance	Variance component	Percentage of total variance
MEP
AIC	543.7		342.6		335.4
Between persons	0.35	64	0.41	77	0.39	76
Within person, between days	0.01	2	0.01	2	0.01	2
Within person, within day	0.19	35	0.11	21	0.11	22
MEHHP
AIC	820.3		579		574.5
Between persons	0.1	18	0.06	17	0.06	17
Within person, between days	0.13	24	0.11	32	0.11	32
Within person, within day	0.32	58	0.17	51	0.17	51