. 2022 Jan 13;12:689. doi: 10.1038/s41598-021-04612-x

Table 2.

The number of metabolites detected/not detected under each sampling condition.

Sampling method	Number of metabolites detected^a	Number of metabolites detected only in this method	Number of metabolites not detected only in this method
US^b	181	3	5
MW^c	159	3	27
SS^d	178	1	8
Total^e	186

^aA total of 153 common metabolites were detected in all the sampling methods.

^bUnstimulated Saliva.

^cMouth-rinsed Water.

^dStimulated Saliva.

^eThe number of metabolites detected in all samples excluding those detected in only a single study subject.