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Comparing the performance indicators of the PTB test validated in the different studies including the present study
| Study | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | PLR | NLR |
|---|---|---|---|---|---|---|
| Grayson et al., 1995 (9) | 66 | 85 | 89 | 56 | 4.40* | 0.15* |
| Shone et al., 2006 (24) | 38 | 91 | 53 | 85 | 4.22* | 0.68* |
| Lavery et al., 2007 (20) | 87 | 87 | 62 | 92 | 6.59 | 0.14* |
| Present study (2010) | 98 | 78 | 95 | 91 | 4.45 | 0.02 |
*Calculated from the data provided by the authors. PLR, positive likelihood ratio; NLR, negative likelihood ratio.
