TABLE 1.
Blood Culture Time to Positivity by Patient Demographics and Clinical Characteristics
| Pathogens | Contaminants | Pathogen-Contaminant Comparison | |||||
|---|---|---|---|---|---|---|---|
| n (%) | Time to Positivity, Median (IQR), h | Pa | n (%) | Time to Positivity, Median (IQR), h | Pa | Pa | |
| Total population | 74 | 16.6 (12.6–21.9) | — | 182 | 25.1 (19.8–33.0) | — | <.001 |
| Sex | .787 | .856 | |||||
| Male | 39 (52.7) | 17.2 (12.5–21.5) | — | 123 (67.6) | 25.1 (19.8–33.3) | — | <.001 |
| Female | 35 (47.3) | 15.8 (12.6–24.3) | — | 59 (32.4) | 25.0 (19.5–32.9) | — | <.001 |
| Age group, d | .328 | .251 | |||||
| 0–28 | 41 (55.4) | 15.8 (12.6–21.0) | — | 77 (42.3) | 24.5 (19.2–31.8) | — | <.001 |
| 29–60 | 33 (44.6) | 17.2 (12.9–24.3) | — | 105 (57.7) | 25.5 (20.6–34.8) | — | <.001 |
| Race category (white, Black, other)b | .418 | .650 | |||||
| White | 45 (64.3) | 14.4 (12.0–21.9) | — | 110 (64.3) | 25.0 (19.0–33.7) | — | <.001 |
| Black or African American | 19 (27.1) | 19.3 (13.7–21.0) | — | 44 (25.7) | 25.2 (21.3–36.1) | — | <.001 |
| Other | 6 (8.6) | 18.0 (13.6–24.3) | — | 17 (9.9) | 25.0 (20.6–29.0) | — | .16 |
| Ethnicity | .597 | .107 | |||||
| Hispanic or Latino | 18 (24.3) | 14.8 (12.4–22.0) | — | 55 (30.2) | 23.4 (18.5–32.7) | — | .001 |
| Not Hispanic or Latino | 56 (75.7) | 17.3 (13.0–21.9) | — | 122 (67.0) | 25.9 (20.6–33.9) | — | <.001 |
| Unknown | 0 (0) | — | 5 (2.7) | 21.8 (20.8–21.9) | — | — | |
| Categories of date and time of ED dischargec | .885 | .327 | |||||
| 00:00–08:00 | 13 (17.6) | 14.4 (12.4–22.0) | — | 48 (26.5) | 27.2 (20.6–35.8) | — | .005 |
| 08:00–16:00 | 20 (27.0) | 19.4 (13.0–21.9) | — | 32 (17.7) | 26.2 (20.5–32.7) | — | <.001 |
| 16:00–24:00 | 41 (55.4) | 16.1 (12.7–21.5) | — | 101 (55.8) | 24.2 (19.2–33.7) | — | <.001 |
| Duration of fever before ED visitd | .366 | .754 | |||||
| <12 h | 37 (68.5) | 14.3 (12.0–20.5) | — | 99 (67.8) | 25.0 (19.8–32.8) | — | <.001 |
| 12–24 h | 12 (22.2) | 19.3 (14.2–23.1) | — | 35 (24.0) | 23.0 (18.2–36.7) | — | .01 |
| >24 h | 5 (9.3) | 12.9 (12.5–22.0) | — | 12 (8.2) | 23.4 (18.8–29.9) | — | .09 |
—, not applicable.
a
Kruskal–Wallis test for comparing 3 or more groups. Wilcoxon rank test without continuity correction for comparing 2 groups.
b
The variable race category had 4 missing values for pathogens and 11 missing values for contaminants.
c
The variable date and time of ED discharge had 1 missing value for contaminants.
d
The variable duration of fever had 20 missing values for pathogens and 36 missing values for contaminants.