Table 2 Performance characteristics of DDIA compared with stool examination
Criterion assessed | Longshang | Hebei | TieGuai | Xinhua | Yuye | Caohui | Jingtou | Total |
|---|---|---|---|---|---|---|---|---|
No. of true positives | 3 | 15 | 21 | 41 | 40 | 51 | 70 | 241 |
No. of false positives | 579 | 186 | 517 | 383 | 490 | 359 | 311 | 2825 |
No. of true negatives | 461 | 685 | 320 | 493 | 290 | 411 | 536 | 3196 |
No. of false negatives | 1 | 1 | 1 | 5 | 4 | 5 | 6 | 23 |
Sensitivity [%, 95% CI] | 75.00 [32.56-100.00] | 93.75 [81.89-100.00] | 95.45 [86.75-100.00] | 89.13 [80.14-98.13] | 90.91 [82.41-99.40] | 91.07 [83.60-98.54] | 92.11 [86.04-98.17] | 91.29 [87.89-94.69] |
Specificity [%, 95% CI] | 44.33 [41.31-47.35] | 78.65 [75.92-81.37] | 38.23 [34.94-41.52] | 56.28 [52.99-59.56] | 37.18 [33.79-40.57] | 53.38 [49.85-56.90] | 63.28 [60.04-66.53] | 53.08 [51.82-54.34] |
PPV [%, 95% CI] | 0.52 [0-1.10]] | 7.46 [3.83-11.10] | 3.90 [2.27-5.54] | 9.67 [6.86-12.48] | 7.55 [5.30-9.80] | 12.44 [9.24-15.63] | 18.37 [14.48-22.26] | 7.86 [6.91-8.81] |
NPV [%, 95% CI] | 99.78 [99.36-100.00] | 99.85 [99.57-100.00] | 99.69 [99.08-100.00] | 99.00 [98.12-99.87] | 98.64 [97.32-99.96] | 98.80 [97.75-99.85] | 98.89 [98.01-99.77] | 99.29 [98.99-99.58] |