Table 1 Sensitivity and specificity of BACTEC TM using “gold standard” definition for infection
Incubation period | “Gold standard”infection | Cumulative number of patients | % correctly identified by culture | |||
|---|---|---|---|---|---|---|
Culture + ve | Culture -ve | Total | Sensitivity (95% CI) | Specificity (95% CI) | ||
1 day | Present | 53 | 26 | 79 | 67.1 (55.6-77.3) | |
Absent | 1 | 242 | 243 | 99.6 (97.7-100) | ||
2 days | Present | 64 | 15 | 79 | 81.0 (70.6-89.0) | |
Absent | 2 | 241 | 243 | 99.2 (97.1-99.9) | ||
3 days | Present | 65 | 14 | 79 | 82.3 (72.1-90.0) | |
Absent | 3 | 240 | 243 | 98.8 (96.4-99.7) | ||
4 days | Present | 65 | 14 | 79 | 82.3 (72.1-90.0) | |
Absent | 4 | 239 | 243 | 98.4 (95.8-99.5) | ||
5 days | Present | 65 | 14 | 79 | 82.3 (72.1-09.0) | |
Absent | 7 | 236 | 243 | 97.1 (94.2-98.8) | ||
6 days | Present | 65 | 14 | 79 | 82.3 (72.1-90.0) | |
Absent | 7 | 236 | 243 | 97.1 (94.2-98.8) | ||
7 days | Present | 65 | 14 | 79 | 82.3 (72.1-90.0) | |
Absent | 7 | 236 | 243 | 97.1 (94.2-98.8) | ||
8 days | Present | 66 | 13 | 79 | 83.5 (73.5-90.9) | |
Absent | 7 | 236 | 243 | 97.1 (94.2-98.8) | ||