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Table 2 Observer assessment of errors, difficulties and steps requiring assistance

From: Usability and acceptability of oral fluid hepatitis C self-testing among people who inject drugs in Coastal Kenya: a cross-sectional pilot study

Observation N = 150 %
Observed errors at each step   
 Pre-testing   
  1. Opening the package 0 0
  2. Reading/using the instructions for use 2 1.3
  3. Removing the test tube from the test pack 0 0
  4. Removing the cap from the test tube 4 2.7
  5. Placing the tube into the stand 27 18
  6. Removing the test device from the test pack 0 0
 Conduct of the test   
  7. Touching the flat pad 9 6
  8. Incorrect manipulation to collect oral fluid 36 24
  9. Wrong placing of the test device in the test tube 9 6
  10. Test device came out of the tube while testing 0 0
  11. Spilling fluid or pouring fluid out of the tube 17 11.3
  12. Improper time keeping 80 53.3
Observed difficulties with testing steps   
 1. Opening the package 27 18
 6. Sliding the tube into the stand 72 48
Assistance provided   
 1. Opening the package 21 14
 2. Opening and removing the cap from the tube 6 4
 3. Placing the tube into the stand 69 46
 4. Placing the test device into the tube 11 7.3
 5. Keeping time 56 37.3
 6. Reading the results 17 11.3
Errors observed for at least one step 107 71.3
Experienced difficulties for at least one step 85 56.7
Assistance provided for at least one step 117 78
Completed all testing steps correctly without any assistance and interpreted the test results correctly 22 14.7