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Table 2 Exclusion of manuscripts from the PubMed MEDLINE and CIG Trials Registry groups of manuscripts Manuscripts inappropriately identified by the PubMed MEDLINE search and the CIG trials registry were removed from review during a screening process performed by one of the authors of the current communication (CY).

From: Effects of the search technique on the measurement of the change in quality of randomized controlled trials over time in the field of brain injury

reason for exclusion

PubMed MEDLINE search

CIG Trials Registry group

INITIALLY IDENTIFIED

139

312

libraries unable to locate

0

15

unrelated to brain injury

2

3

duplicate publications

2

8

inaccurately claimed to be a controlled trial

22

47

inaccurately claimed to use randomization

11

30

abstracts / letters-to-the-editor

1

31

protocol descriptions

3

0

incomplete / preliminary reports

0

4

non-human subjects

0

1

TOTAL NUMBER DISCARDED

41

139

REMAINING

98 (70% of initially identified)

173 (55% of initially identified)