A list of the most consistent metabolites

Metabolite (HMDB ID)	Inter-operator group		Subset 1 vs. 3		Subset 2 vs. 4
Metabolite (HMDB ID)	r_s	zero	r_s	zero	r_s	zero
Creatinine (HMDB00562)	1	0	0.999	0	1	0
Dimethylamine (HMDB00087)	0.999	0	0.999	0	1	0
Hippurate (HMDB00714)	0.999	0	0.999	0	0.999	0
Glycine (HMDB00123)	0.998	0	0.998	0	0.999	0
L-Alanine (HMDB00161)	0.999	0	0.995	0	0.999	0
Trigonelline (HMDB00875)	0.999	0	0.972	0	0.999	0
Trimethylamine N-oxide (HMDB00925)	0.999	0	0.998	0	0.998	0
Formate (HMDB00142)	0.997	0	0.994	1.67	0.997	0
Succinate (HMD00254)	0.996	0	0.987	0	0.997	0

Table 2: A list of the most consistent metabolites determined in the subjective analysis (rated Excellent) and the values for Spearman’s correlation coefficient (r_s) and the percentage difference in zero fraction for the inter-operator and over-time experiments (Subset 1 vs. 3 and Subset 2 vs. 4).