Table 2. OTU counts, richness and diversity estimates for the bacteria in subgingival plaque samples before and after intervention.

Sample	OTUs*	ACE estimator	Shannon index	Simpson index	Pilous evenness
Co-pre-1	2,365 (5,273)	2,421	4.36	0.05	0.56
Co-post-1	1,710 (3,848)	1,749	4.45	0.02	0.59
Co-pre-2	1,945 (4,377)	1,989	4.42	0.04	0.58
Co-post-2	2,659 (5,705)	2,718	4.91	0.01	0.62
Ex-pre-1	1,648 (3,499)	1,691	3.68	0.11	0.49
Ex-post-1	2,051 (4,449)	2,100	4.03	0.05	0.53
Ex-pre-2	2,412 (6,058)	2,476	4.19	0.05	0.54
Ex-post-2	2,197 (5,051)	2,250	4.38	0.03	0.60

^*OTU clusters were generated by complete linkage clustering at 97% identity threshold excluding singleton clusters; numbers in parentheses give OTU counts including singleton clusters.