Table 3. Summary of categorical principal components analysis.

(CATPCA) for human urine and plasma.

Urine CATPCA model
Dimension	Cronbach’s alpha	Variance
		Total (eigenvalue)	% of variance
1	0.970	9.01	75.1
2	0.138	1.15	9.54
Total	0.984a	10.2	84.6
Plasma CATPCA model
1	0.985	11.1	85.2
2	-0.069	0.940	7.23
Total	0.993a	12.0	92.4

^a Cronbach’s alpha means is based on the mean of the eigenvalue.