Table 3.
Number of patients with endoscopic diagnosis; sensitivity, specificity, PPV and NPV as GBS increases
| GBS | Pathology (n=304) | Sensitivity | Specificity | PPV | NPV |
|---|---|---|---|---|---|
| 0 | 35 (56.45%) | 88.90% (84.35–91.85) | 27.85% (19.21–37.85) | 79.35% (77.14–81.40) | 43.55% (33.04–54.67) |
| ≤1 | 57 (55.34%) | 81.25% (76.40–85.48) | 48.42% (38.04–58.90) | 83.45% (80.46–86.05) | 44.66% (37.12–52.46) |
| ≤2 | 78 (58.78%) | 74.34% (69.05–79.16) | 61.05% (50.50–70.89) | 85.93% (82.48–88.79) | 42.65% (36.68–48.84) |
| ≤3 | 95 (58.78%) | 68.75% (63.21–73.92) | 71.58%(61.40–80.36) | 88.56% (84.79–91.49) | 41.72% (36.73–46.88) |
| ≤4 | 115 (60.85%) | 62.17% (56.46–67.64) | 77.89 % (68.22–85.77) | 90.00% (85.93–92.99) | 39.15% (34.97–43.50) |
| ≤5 | 134 (53.81%) | 55.92% (50.14–61.58) | 80.00% (70.54–87.51) | 89.95% (85.53–93.12) | 36.19% (32.55–40.00) |
| ≤6 | 146 (65.47%) | 51.97%(46.20–57.71) | 81.05% (71.72–88.37) | 89.77% (85.10–93.10) | 34.53% (31.18–38.04) |
| ≤7 | 172 (66.15%) | 43.42% (37.77–49.20) | 92.63% (85.41–96.99) | 94.96% (90.14–97.49) | 33.85% (31.35–36.44) |
| ≤8 | 191 (67.77%) | 37.17%(31.72–42.87) | 95.79% (89.57–98.84) | 96.58% (91.46–96.68) | 32.27% (30.20–34.41) |
GBS = Glasgow Blatchford score; NPV = negative predictive value; PPV = positive predictive value