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Table 1 Overview of discrepant results among all data entered, and among discrepant results: number of blanks, out of range entries and logical errors

From: Analysis of erroneous data entries in paper based and electronic data collection

Variable type No. of variables All Among contradictory entries
Contradictory entries/total (%) Blanks in Epidata/total (%) Blanks in AKVO/total (%) p blanks Epidata: out of range entries/total (%) AKVO: out of range entries/total (%) p out of range entries Epidata: logical errors/total (%) AKVO: logical errors/total (%) p logical errors
Date 3 13.0%
(140/1074)
0.0%
(0/140)
52.9%
(74/140)
< 0.001 0.0%
(0/140)
0.7%
(1/140)
0.317 0.0%
(0/140)a
0.7%
(1/140)a
0.317
Time 2 15.8%
(113/716)
0.0%
(0/113)
0.0%
(0/113)
1.000 0.0%
(0/113)
0.0%
(0/113)
1.000 NA NA
Categorical 35 10.9%
(1370/12,530)
60.1%
(823/1370)
23.7%
(325/1370)
< 0.001 NA NA NA NA
Continuous 10 18.0%
(643/3580)
26.9%
(178/643)
14.1%
(91/643)
< 0.001 0.2%
(1/643)
0.0%
(0/643)
0.317 0.0%
(0/643)b
0.2%
(1/643)b
0.317
Text 2 12.0%
(86/716)
1.2%
(1/86)
8.1%
(7/86)
0.034 NA NA NA NA
Total 52 12.6%
(2352/18,616)
42.6%
(1002/2352)
21.1%
(497/2352)
< 0.001 0.1%
(1/896)
0.1%
(1/896)
1.000 0.0%
(0/783)
0.1%
(1/783)
0.318
  1. aCounting all cases with date of birth after date of enrolment
  2. bCounting all cases with a BMI < 12 or BMI > 40 among discrepant results