Table 1.

Inter-laboratory lipidomics study aligned-feature summary.

	Positive			Negative
Detected Across Four Datasets	601			215
Detected in I, II, and III	155			30
Detected in I, II, and IV	280			115
Detected in I, III, and IV	580			533
Detected in I and II	156			211
Detected in I and III	1053			398
Detected in I and IV	743			670
Detected in I only	5202			3691
	II	III	IV	II	III	IV
Detected Outside I	2617	22,516	17,165	1676	6132	7402