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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)