TABLE 4.
Percent positivity rates, analyzed by bottle type and volume compliance statusa
| Bottle type | Compliant |
Noncompliant, ≤10-ml vol |
Noncompliant, >10-ml vol |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No. of bottle pairs | % positives | % significant positives | % contaminated | No. of bottle pairs | % positives | % significant positives | % contaminated | No. of bottle pairs | % positives | % significant positives | % contaminated | |
| SA | 754 | 7.3 | 5.6 | 1.6 | 267 | 7.5 | 4.5 | 3.0 | 276 | 5.8 | 4.7 | 1.1 |
| SN | 826 | 5.0 | 4.2 | 0.6 | 235 | 4.3 | 3.0 | 1.3 | 195 | 3.1 | 3.1 | 0.0 |
| FA Plus | 1,053 | 8.9 | 7.0 | 1.6 | 388 | 7.7 | 5.9 | 1.8 | 261 | 14.2b | 11.9b | 2.3 |
| FN Plus | 906 | 7.4 | 5.7 | 1.7 | 275 | 9.5 | 8.0 | 1.5 | 273 | 10.3 | 9.2c | 1.1 |
| All | 3,539 | 7.3 | 5.7 | 1.4 | 1,165 | 7.4 | 5.5 | 1.9 | 1,005 | 8.7 | 7.5 | 1.2 |
a
Positive culture results imply that at least one bottle from a bottle pair gave a positive result and a positive subculture was obtained. Data for 5 indeterminate positives, all in volume-compliant bottle sets, 1 each in SA and SN and 3 in FA Plus, were excluded from this table.
b
Data were statistically significant by Pearson's chi-square test; P = 0.011 (all positives) and P = 0.010 (significant positives).
c
Data were statistically significant; P = 0.045.