Table 3. Comparison of the inter-individual variations and minimal sample sizes of the urinary and CSF proteomes between this study and previous studies.

		Quantification method	Inter-individual variation	Minimal sample size (2-fold)
Urine	Nagaraj et al.[11]	Label-free	66%	16
	Liu et al.[1]	Spectrum counting	71%	18
	Our study	iTRAQ	26.20%	5
CSF	Stoop et al.[13]	Label-free	42%	8
	Perrin et al.[15]	Label-free	55%	12
	Our study	iTRAQ	18.30%	4