Table 5. The observed frequency and the predicted probability of PVC-associated gram-negative bloodstream infection for each cutoff point.

Point	Observed frequency, % (case/total)	Predicted probability, % (95% CI)
−1	11.1 (1/9)	18.0 (7.9–35.9)
0	44.4 (12/27)	37.3 (24.8–51.7)
1	58.3 (14/24)	61.6 (50.1–72.0)
2	73.9 (17/23)	82.3 (68.2–89.8)
3	100 (14/14)	92.1 (79.9–97.2)
4	100 (2/2)	96.9 (87.6–99.3)

CI, confidence interval.