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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