Table 2. Results of the cross-validation procedure.

Stage	Estimation set	Estimated parameters			Sum of CV%	CVPEE
		SRex (CV%)	km (CV%)	ke (CV%)			RaIL6
		pg·ml-1·min-1	min-1	min-1			pg·min-1
1	D1	0.045 (7)	0.004 (10)	0.053 (<1)	<18	17.5	1,261
2	D2	0.014 (9)	0.002 (<1)	0.012 (11)	<21	48.6	296
3	D3	0.038 (171)	0.0002 (189)	0.0047 (92)	452	107	58
4	D4	0.637 (<1)	0.00008 (23)	0.013 (74)	<98	86.2	340