Table 3.
Sensitivity, Specificity, and Positive and Negative Predictive Values in 202 Specimens of Voided Midstream Urine.*
| Organism | Sensitivity | Specificity | Positive Predictive Value |
Negative Predictive Value |
|---|---|---|---|---|
| number/total number (percent) | ||||
| E. coli (CFU/ml) | ||||
| ≥10 | 120/121 (99) | 70/81 (86) | 120/131(92) | 70/71 (99) |
| ≥102 | 114/121 (94) | 72/81 (89) | 114/123 (93) | 72/79 (91) |
| ≥103 | 106/121 (88) | 77/81 (95) | 106/110(96) | 77/92 (84) |
| ≥104 | 98/121 (81) | 80/81 (99) | 98/99 (99) | 80/103 (78) |
| ≥105 | 72/121 (60) | 80/81 (99) | 72/73 (99) | 80/129 (62) |
| Enterococci (CFU/ml) | ||||
| ≥102 | 2/2 (100) | 182/200 (91) | 2/20 (10) | 182/182 (100) |
| ≥103 | 2/2 (100) | 187/200 (94) | 2/15 (13) | 187/187 (100) |
| ≥104 | 2/2 (100) | 196/200 (98) | 2/6 (33) | 196/196 (100) |
| ≥105 | 1/2 (50) | 197/200 (98) | 1/4 (25) | 197/198 (99) |
| Group B streptococci (CFU/ml) | ||||
| ≥102 | 2/2 (100) | 177/200 (88) | 2/25 (8) | 177/177 (100) |
| ≥103 | 1/2 (50) | 183/200 (92) | 1/18 (6) | 183/184 (99) |
| ≥104 | 1/2 (50) | 194/200 (97) | 1/7 (14) | 194/195 (99) |
| ≥105 | 1/2 (50) | 199/200 (>99) | 1/2 (50) | 199/200 (>99) |
*
The presence or absence of any quantity of each organism in catheter urine was the reference. CFU denotes colony-forming units.