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Table 6 Initial results (before) and final results after the correction of data entry errors and error rates

From: Development of a data collection and management system in West Africa: challenges and sustainability

Study Sites

Numbers of subjects

# Subjects with data entry errors

before → after

Subject error rates (%)

before → after

Data variables entered per study site (#)

Variable Errors per Study Site

before → after

Variable error rates (%)

before → after

Dangassa

1492

659 → 0

44.17 → 0.00%

1 505 300

23 099 → 0

1.54 → 0.00%

Dioro

1533

678 → 0

44.23 → 0.00%

1 058 853

22 479 → 0

2.12 → 0.00%

Gambissara

1566

123 → 0

7.85 → 0.00%

1 432 503

212 → 0

0.015 → 0.00%

Madina Fall

1868

311 → 0

16.65 → 0.00%

1 475 704

400 → 0

0.027 → 0.00%

Totals

6459

1771 → 0

27.42 → 0.00%

5 472 360

46 190 → 0

0.84% → 0.00%

  1. Final data entry error rates after correcting double data entry errors
  2. Rows indicate the sites from which data were obtained (column 1), the number of subjects participating in the cohort at each study site (column 2), the number of subjects with double data entry errors both before and after correction (left and right sides of column 3), the subject data entry error rates (number of errors divided by the number of subjects) before and after correction (left and right sides of column 4), the number of data points for study variables entered at each study site (column 5), number of data entry errors for study variables per study site before and after correction (left and right sides of column 6) and the mean number of errors (variable error rate) for each variable as a percent (left and right sides of column 7). The subject and variable error rates in columns 4 and 7 were calculated by dividing the number of errors per subject or study variable by the number of subjects or data points for that variable (columns 3 and 6 were divided by columns 2 and 5)