Table 1.

The Fisher's exact test was used to determine if there was a significant difference between the frequency that samples occurred in each of the groups.

	Women vaginally colonized with S. aureus tst+		Women without vaginal S. aureus tst+
Origin of sample	Observationsa	Expected frequencyb	Observations	Expected frequency	Total samples per group
Group 1	1	2.0588	4	2.9712	5
Group 2	1	1.6471	3	2.3529	4
Group 3	10	8.6471	11	12.3529	21
Group 4	7	6.1765	8	8.8235	15
Other	2	2.4705	4	3.5294	6
Total number of samples analyzed	21		30		51

^aObservations were counted by identifying the number of samples of a particular colonization status within each group identified in the cluster analysis.

^bExpected frequencies were calculated by multiplying the total number of samples with the same colonization status by the number of samples identified in the corresponding group (Fig. 1) and then divided by the total number of samples.