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Table 1 Working steps and number of time measurements to determine the costs of the Kato-Katz and FLOTAC method for the diagnosis of soil-transmitted helminths in Zanzibar.

From: Comparative cost assessment of the Kato-Katz and FLOTAC techniques for soil-transmitted helminth diagnosis in epidemiological surveys

Working step

n

Number of measurementsa

Kato-Katz (K-K) measurements

  

   (K1a) Labeling of K-K slides

109

19 × 5; 2 × 4; 1 × 6

   (K1b) Preparation of duplicate K-K slides

137

121 × 1; 6 × 0.5; 5 × 2; 1 × 3

   (K2) Microscopy morning

341

32 × 1; 22 × 2; 22 × 8; 21 × 4; 1 × 5

   (K3) Microscopy afternoon

396

44 × 1; 26 × 8; 24 × 2; 24 × 4

   (K6a) Washing of K-K slides

180

1 × 180

   (K6b) Washing spatula and template

297

1 × 91; 1 × 96; 1 × 110

   (K6c) Cutting cellophane paper

82

1 × 82

   (K6d) Cutting wire mesh

206

1 × 206

FLOTAC measurements

  

   (F1) Measurement of 1 g of stool and homogenization

168

29 × 5; 1 × 6; 1 × 7; 1 × 10

   (F2a) Filter (inclusive labeling)

31

31 × 1

   (F2b) Filter (exclusive labeling)

41

25 × 1; 4 × 3; 2 × 2

   (F2c) Labeling Falcon tubes

33

3 × 6; 2 × 4; 1 × 7

   (F3) Centrifugation of tubes and filling with FS

62

20 × 3; 1 × 2

   (F4) Assembling FLOTAC apparatus

29

29 × 1

   (F5) Filling FLOTAC apparatus

55

55 × 1

   (F6) Centrifugation and translation of FLOTAC apparatus

36

18 × 2

   (F7) Reading first chamber

120

120 × 1

   (F8) Reading second chamber

119

119 × 1

   (F11a) Washing filter and beaker

82

9 × 1; 9 × 6; 1 × 4; 1 × 7; 1 × 8

   (F11b) Opening FLOTAC apparatus

52

33 × 1; 1 × 2; 1 × 3; 1 × 14

   (F11c) Washing FLOTAC apparatus

26

2 × 3; 1 × 2; 1 × 4; 1 × 14

   (F11d) Washing Falcon tube

208

3 × 4; 2 × 5; 1 × 101; 1 × 84; 1 × 1

   (F11e) Washing pipettes

200

9 × 1; 1 × 105; 1 × 84; 1 × 1

Measurements for both techniques

  

   (S1-S3) Collection of stool samples at school

2,921

b

   (K4/F9) Data entry (demographic data)

13

1 × 13

   (K5/F10) Data entry (results)

407

5 × 22; 5 × 23; 3 × 20; 3 × 9; 2 × 14; 1 × 5; 1 × 15; 1 × 21; 1 × 26

   (K6f/F11f) Putting a piece of paper into an empty container to alleviate cleaning of container

138

7 × 10; 1 × 68

   (K6g/F11g) Removing stool out of container (before cleaning)

260

4 × 10; 2 × 36; 1 × 38; 1 × 52; 1 × 58

   (K6h/F11h) Washing of stool container (without lid)

65

5 × 10; 1 × 15

   (K6i/F11i) Washing lid

56

3 × 10; 1 × 5; 1 × 6; 1 × 15

   (K6j/F11j) Erasing of IDs from stool container

290

18 × 10; 1 × 110

  1. a Interpreted as follows: for example, in the working step "Labeling of K-K slides" it was measured 19 times how much time was required to label 5 slides, 2 times the time for labeling 4 slides and once the time for labeling 6 slides.
  2. b 2,921 stool samples were collected in 38 visits at schools, where always a different number of stool samples was collected.
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