Table 1.
Blood Culture (BCx) Positivity by Time Interval and by Causative Pathogen
| Blood Culture Pairs by Interval (n = 2,928, %) | Overall Blood Culture Positivity, (n = 439, 15%) | P Value a | Positivity, Gram Positives (n = 234, 8%) | P Value a | Positivity, Gram Negatives (n = 205, 7%) | P Value a | Positivity Anaerobes (n = 24, 1%) | P Value a | Positivity Yeast (n = 7, 0.2%) | P Value* | Positivity Polymicrobial (n = 57, 13%) | P Value a |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0–9 min (n = 789, 26.9%) | 105 (13.3) | .20 .07 |
57 (7.2) | .51 .24 |
46 (5.8) | .31 .25 |
5 (0.6) | .12 .09 |
0 (0) | .04 .01 |
10/(9.5) | .10 .04 |
| 10–29 min (n = 1,733, 59.2%) | 265 (15.3) | 140 (8.1) | 130 (7.5) | 12 (0.7) | 4 (0.2) | 33 (12.5) | ||||||
| ≥30 min (n = 406, 13.9% | 69 (17.0) | 37 (9.1) | 29 (7.1) | 7 (1.7) | 3 (0.7) | 14 (20) |
a
First P values are from χ2 or Fisher exact test; second P values are from nonparametric tests for trend.