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Table 2 potential mistakes (pM) found in the electronic check and relative number of real mistakes (M) encountered in manual hard-copy check.

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 I Phase II Phase III Phase IV
  pM M pM M Pm M pM M
Age 216 3 19 3 80 1 101 4
Age first parturition 267 4 30 1 37 2 22 1
Age marriage 153 1 65 3 75 0 43 1
Education 210 0 NA NA 71 3 44 20
Family position 210 0 NA NA 11 2 13 2
First sexual intercourse 205 1 82 2 101 0 78 1
Height 728 28 54 7 26 2 19 1
Insurance 210 4 NA NA 35 22 36 3
Provenance 210 1 NA NA 15 4 28 3
Sons 215 11 NA NA 4 0 4 1
N of births (parturition) 11 7 3 3 3 1 4 0
Weight 690 30 41 4 32 6 26 1
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