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Table 2 Accuracy and precision of blood volumes transferred by health workers with each device

From: Blood transfer devices for malaria rapid diagnostic tests: evaluation of accuracy, safety and ease of use

 

Nigeria

78 users

Philippines

75 users

Uganda

74 users

All Sites Combined

227 users

 

Volume in μLa

mean (std dev), range

p-valuec

Volume in μLa

mean (std dev), range

p-valuec

Volume in μLa

mean (std dev), range

p-valuec

Volume in μLa

mean (std dev), range

p-valuec

LOOP

4.219

(0.603)

2.803 - 5.804

<0.0001

3.842

(0.607)

2.597 - 5.312

<0.0001

4.841

(0.968)

2.845 - 9.306

0.1611

4.297

(0.846)

2.597 - 9.306

<0.0001

STRAW-PIPETTE

5.004

(1.191)

1.796 - 7.602

0.9768

5.778

(1.199)

2.922 - 9.551

<0.0001

7.042

(1.671)

2.038 - 9.469

<0.0001

5.924

(1.601)

1.796 - 9.551

<0.0001

GLASS CAPILLARYb

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CALIBRATED PIPETTE

5.875

(1.597)

2.259 - 10.287

<0.0001

5.649

(1.437)

2.681 - 10.406

0.0002

7.086

(1.507)

3.444 - 11.855

<0.0001

6.195

(1.635)

2.259 - 11.855

<0.0001

INVERTED CUP

4.525

(0.683)

2.371 - 5.885

<0.0001

4.139

(0.958)

2.874 - 7.202

<0.0001

5.088

(0.824)

3.499 - 7.382

0.3633

4.581

(0.910)

2.371 - 7.382

<0.0001

  1. a Estimated from the areas of individual blood spots made by transferring blood to absorbent filter paper.
  2. b The glass capillary is excluded from this analysis because the filter paper surface used in this study does not consistently draw blood from the capillary device, and consequently the resulting blood spots do not accurately reflect its transfer volume.
  3. cComparison of mean volume with goal volume of 5 microliters (μL).