Table 1.

Sample Sizes Used in Replicate Measurements of Microbiota Collected in 3 Studies, 1985–2013

Study	Sample Size, no.
NCI CRC case-control study (1985–1987) (28, 29)
Stool	44
Costa Rica study (2010–2012)a
Stool	116
Saliva	42
HMP (2008–2013) (30)
Stool	107
Saliva	94
Mouth (oral average)	103
Airways (anterior nares)	78
Skin (average)	63
Vagina (average)	37

Abbreviations: CRC, colorectal cancer; HMP, Human Microbiome Project; NCI, National Cancer Institute.

^a Dr. Paula González, INCIENSA Foundation, unpublished data, 2015.