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Table 1 Pattern of duplicate publications

From: Duplicate publication of articles used in meta-analysis in Korea

Meta-analysis

Report

Common authorship

No. of subjects

Patterns of duplicate publication

Year of publication

Source of funding

Cross reference

Meta-analysis 1

 

Main

Partial

45

 

1998

None declared

no

Duplicate

Partial

45

Identical study sample and reported partially identical outcomes (copy)

2002

None declared

no

Meta-analysis 2

 

Main

Complete

175

 

1992

None declared

no

Duplicate

Complete

50

Documented parts of a large trial and reported identical outcomes (disaggregation)

1993

None declared

no

Meta-analysis 3

 

Main

none

100 (case 43)

 

1996

None declared

no

Duplicate

none

202 (case 69)

New data were added to a main article and reported identical outcomes (Imalas)

1999

None declared

no

Meta-analysis 4

 

Main

Complete

296

 

2003

None declared

no

Duplicate

Complete

197

Duplicates originated from 1 study sample but reported on different outcomes (fragmentation)

2003

None declared

no

Meta-analysis 5

 

Main

Partial

64 (case 11)

 

1996

None declared

no

Duplicate

Partial

99 (case 26)

New data were added to a main article and reported almost identical outcomes (Imalas)

1998

None declared

no

Meta-analysis 6

 

Main

Partial

394

 

2003

None declared

no

 

Duplicate

Partial

85

Documented parts of a large trial and reported identical outcomes(disaggregation)

2005

None declared

no