Diagnostic test accuracy of Siemens Multistix testing
| Test (positive cut-point) | Sensitivity (95% CI) | Specificity (95% CI) | PPV (95% CI) | NPV (95% CI) |
| Leucocyte (trace) | 0.84 (0.69 to 0.94) | 0.73 (0.67 to 0.79) | 0.33 (0.24 to 0.44) | 0.97 (0.93 to 0.99) |
| Leucocyte (1+) | 0.82 (0.66 to 0.92) | 0.82 (0.76 to 0.87) | 0.42 (0.31 to 0.54) | 0.97 (0.93 to 0.99) |
| Leucocyte (2+) | 0.66 (0.49 to 0.80) | 0.91 (0.87 to 0.94) | 0.54 (0.39 to 0.69) | 0.94 (0.90 to 0.97) |
| Leucocyte (3) | 0.58 (0.41 to 0.74) | 0.96 (0.93 to 0.98) | 0.71 (0.52 to 0.86) | 0.93 (0.90 to 0.96) |
| Nitrite (trace) | 0.42 (0.26 to 0.59) | 0.91 (0.86 to 0.94) | 0.42 (0.26 to 0.59) | 0.91 (0.86 to 0.94) |
| Nitrite (1+) | 0.42 (0.26 to 0.59) | 0.95 (0.91 to 0.97) | 0.57 (0.37 to 0.76) | 0.91 (0.87 to 0.94) |
| Nitrite (2+) | 0.16 (0.06 to 0.31) | 0.99 (0.97 to 1.00) | 0.75 (0.35 to 0.96) | 0.88 (0.84 to 0.92) |
| Nitrite (3+) | 0.03 (0.00 to 0.14) | 0.98 (0.95 to 0.99) | 0.17 (0.00 to 0.64) | 0.86 (0.82 to 0.90) |
| Leucocyte or nitrite (trace) | 0.84 (0.69 to 0.94) | 0.71 (0.65 to 0.77) | 0.32 (0.23 to 0.42) | 0.97 (0.93 to 0.99) |
| Leucocyte or nitrite (1+) | 0.82 (0.66 to 0.92) | 0.81 (0.75 to 0.86) | 0.41 (0.30 to 0.53) | 0.96 (0.93 to 0.99) |
| Leucocyte or nitrite (2+) | 0.66 (0.49 to 0.80) | 0.90 (0.86 to 0.94) | 0.52 (0.37 to 0.67) | 0.94 (0.90 to 0.97) |
| Leucocyte or nitrite (3+) | 0.61 (0.43 to 0.76) | 0.94 (0.90 to 0.97) | 0.62 (0.45 to 0.78) | 0.94 (0.90 to 0.96) |
| Leucocyte and nitrite (trace) | 0.42 (0.26 to 0.59) | 0.93 (0.89 to 0.96) | 0.48 (0.31 to 0.66) | 0.91 (0.87 to 0.94) |
| Leucocyte and nitrite (1+) | 0.42 (0.26 to 0.59) | 0.95 (0.92 to 0.98) | 0.59 (0.39 to 0.78) | 0.91 (0.87 to 0.94) |
| Leucocyte and nitrite (2+) | 0.16 (0.06 to 0.31) | 1.00 (0.98 to 1.00) | 1.00 (0.54 to 1.00) | 0.88 (0.84 to 0.92) |
| Leucocyte and nitrite (3+) | 0.00 (0.00 to 0.09) | 1.00 (0.98 to 1.00) | N/A | 0.86 (0.82 to 0.90) |
N/A, not applicable; NPV, negative predictive value; PPV, positive predictive value.