Table 3 

Overview of the characteristics of the GI analyses using decreasing similarity thresholds (for all GIs > 10 kb) 

Stringency 
Total number of GIs 
Number of genomes 
GI < CI 
Clusters 
GIs in clusters* 
Percentage clustered (%) 
Prediction Accuracy (%) 



CI0 
++++ 
2191 
267 
1 
20** 
40** 
1.8 
99.9 
CI5 
+++ 
2047 
260 
9 
99 
202 
10.0 
98.6 
CI10 
++ 
1787 
246 
11 
134 
271 
15.3 
97.5 
CI25 
+ 
1370 
220 
16 
185 
383 
28.3 
94.8 


Total analyzed 
2609 
322 



The totals represent the total numbers in the original data set from IslandViewer. *) The percentage of clustered GIs (second last column) excludes 17 GIs from the total number of GIs (third column), since there are 17 genomes with a single GI only, and with less than two GIs there can be no clustering. **) Six out of 20 clusters contain in fact largely identical Genomic Islands, which explains their high compositional similarity. 

Roos and van Passel BMC Genomics 2011 12:427 doi:10.1186/1471216412427 