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Table 3 Diagnostic performance of the Kato-Katz method for T. trichiura infection

From: Improving diagnostic performance of the Kato-Katz method for Clonorchis sinensis infection through multiple samples

No. of smears No. of positive cases No. of negative cases Prevalence (95% CI) (%) False negative rate (%) GMEPG of the positive cases (1)a Overestimation of GMEPG (%)b GMEPG of the positive cases (2)c GMEPG of the false negative casesc
1 stool × 1 smear 16 381 4.0 (2.1–6.0) 20.0 58.0 94.7 35.0 15.7d
1 stool × 2 smears 17 380 4.3 (2.3–6.3) 15.0 44.7 49.9 32.0 19.7e
1 stool × 3 smears 18 379 4.5 (2.5–6.6) 10.0 36.7 23.3 30.8 21.9f
2 stools × 1 smear 18 379 4.5 (2.5–6.6) 10.0 37.4 25.5 33.2 11.3g
2 stools × 2 smears 20 377 5.0 (2.9–7.2) 0.0 32.0 7.4 29.8
2 stools × 3 smears 20 377 5.0 (2.9–7.2) 0.0 29.8 0.0 29.8
  1. aOnly the available smears were calculated
  2. bThe calculation was based on the GMEPG of the positive cases (1)
  3. cAll six smears in ‘gold’ standard were calculated
  4. dt(18) = 1.14, P = 0.270, compared to the GMEPG of the positive cases (2)
  5. et(18) = 0.60, P = 0.554, compared to the GMEPG of the positive cases (2)
  6. ft(18) = 0.35, P = 0.727, compared to the GMEPG of the positive cases (2)
  7. gt(18) = 1.15, P = 0.264, compared to the GMEPG of the positive cases (2)