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

Table 1 Number of insertions per each parameter analyzed for each phase of the study.

Parameter	field type	phase I	phase II	phase III	phase IV	Total insertions
All	-	325,773	151,734	145,401	107,286	730,194
Male	-	140,658	641,58	55,488	44,064	260,304
Females	-	185,115	87,576	89,913	63,222	362,604
Age	n	2,884	1,341	1,275	946	6,446
Age at first parturition^#	n	1,505	712	731	514	3,462
Age marriage^#	n	1,505	712	731	514	3,462
Education	c	2,884	1,341	1,275	946	6,446
Family position	c	2,884	1,341	1,275	946	6,446
First sexual intercourse^#	n	1,505	712	731	514	3,462
Height	n	2,884	1,341	1,275	946	6,446
Insurance	c	2,884	1,341	1,275	946	6,446
Provenance	c	2,884	1,341	1,275	946	6,446
Sons	n	2,884	1,341	1,275	946	6,446
Number of parturitions ^#	n	1,505	712	731	514	3,462
Urban community	c	2,884	1,341	1,275	946	6,446
Weight	n	2,884	1,341	1,275	946	6,446

Insertions concerning only females (^#), insertion-fields type: combo-boxes (c) and numeric (n).

ISSN: 1471-2288