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Table 3 For electronic-check the analyses compared the proportion of real mistakes vs. the proportion of potential mistakes.

From: Double–blind control of the data manager doesn't have any impact on data entry reliability and should be considered as an avoidable cost

  Phase Insertion fields position p.
   Initial
(%)
End
(%)
 
Random selection of questionnaires I 0,55 3,64 0.0026
  II 3,4 11,66 0.0210
  III 0 6,25 0.0008
  IV 1,65 3,93 < 0.001
Electronic Check I 11,8 15,7 < 0.001
  II 2,23 10,3 < 0.001
  III 4,39 12,03 < 0.001
  IV 6,71 11,77 < 0.001
  1. For random selection of questionnaires we evaluated the number of mistakes encountered vs. the number of questionnaire randomized for each field controlled.
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