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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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BMC Medical Research Methodology

ISSN: 1471-2288

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