TABLE 1.

Reproducibility of the T-RFLP data^a

Sample	n	Sørensen index		Steinhaus index		Coefficient of variation (%)
		Mean	95% Confidence interval	Mean	95% Confidence interval	Sørensen index	Steinhaus index
Phenol-fed reactor	9	0.966	±0.012	0.921	±0.013	3.5	4.3
Phenol-plus-TCE-fed reactor	9	0.937	±0.010	0.851	±0.018	3.3	6.2
TAMRA GS2500 standard	32	1		0.931	±0.003	0.0	3.4

^aMeans and 95% confidence intervals for Sørensen and Steinhaus similarity indices were calculated from pairwise comparisons. The TAMRA GS2500 standard is a molecular weight marker used to determine the sizes of the fragments in the gels.