. 2012 Aug;80(8):2589–2600. doi: 10.1128/IAI.00210-12

Table 3.

Competitive index for mice inoculated with a 1:1 mixture of wild-type STEC 88-0643 and Δure mutant

Day	No. of mice colonized with wild type	No. of mice colonized with Δure	CI^a		P value^b
Day	No. of mice colonized with wild type	No. of mice colonized with Δure	Mean	Median	P value^b
1	17	17	2.28	2.23	0.0002
2	17	17	3.38	2.33	0.0014
3	16	16	9.44	5.33	<0.0001
4	15	15	99.52	7.25	0.0006
5	14	12	54.46	13.51	0.0005
6	14	11	389.1	11.70	0.002
7	14	10	139.9	12.98	0.0078

CI (competitive index) calculated as CFU per gram of feces for wild-type strain/Δure mutant. Mice for which colonization by the Δure mutant could no longer be detected are not included in this analysis.

P values were calculated using the Wilcoxon signed-rank test.