TABLE 5.
Influence of the number of colonies of corynebacteria on the probability of isolating S. aureus strains bearing agr-1Sa and agr-2Sa
| No. of Corynebacterium colonies (CFU) |
S. aureus odds ratio (CI95%), P valuea for:
|
|
|---|---|---|
| agr-1Sa | agr-2Sa | |
| <102 | 1 | 1 |
| 102-103 | 0.93 (0.38-2.19), 0.84 | 1.69 (0.55-5.26), 0.35 |
| 103-104 | NIb | 0.77 (0.08-7.20), 0.81 |
| ≥104 | 0.10 (0.02-0.48), 0.004 | 0.33 (0.06-1.61), 0.17 |
a
In this model, the colony counts were categorized into four groups for corynebacteria as follows: <102 (reference group, for which only the odds ratio is given), 102 to 103, 103 to 104, and ≥ 104 CFU. CI95% 95% confidence interval.
b
NI, not informative because of the small number of subjects.