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Table 2 Performance characteristics of DDIA compared with stool examination

From: Performance of a dipstick dye immunoassay for rapid screening of Schistosoma japonicum infection in areas of low endemicity

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]
  1. CI: Confidence interval