Table 4. Results of principal components analysis of the data generated by the culture-independent study.

Principal component	Eigenvalue	Proportion of variabilityrepresented	Cumulative proportion of variability represented
1	31.95	0.21	0.21
2	25.43	0.16	0.37
3	23.38	0.15	0.52
4	15.48	0.10	0.62
5	13.71	0.09	0.71
6	11.50	0.07	0.78
7	10.30	0.07	0.85
8	9.23	0.06	0.91
9	8.02	0.05	0.96
10	5.99	0.04	1.00