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Table 1 Comparison of mean area of blood spots or mean height of blood collected by various techniques against pipetted standard volumes in controlled laboratory conditions.

From: An assessment of various blood collection and transfer methods used for malaria rapid diagnostic tests

Device Mean area (mm2) or height (mm) of blood collected Sd Mean area (mm2) or height (mm) of pipetted standard blood volumes (n = 20) sd P valuea (one-tailed)
Straw (n = 56) 27.50 18.51 14.69 3.32 P < 0.05
Loop (n = 56) 25.27 10.74    P < 0.05
Plastic Pipette (n = 56) 14.66 12.97 25.84 6.01 P < 0.05
Glass Capillary Tubeb (n = 44) 3.35c 1.76 4.75c 0.34 P < 0.05
  1. a Difference between actual and intended (pipetted) volumes.
  2. b Different set of health workers used. Four further technicians failed to deliver any blood, and results are not included.
  3. c mean height
  4. sd standard deviation