Table 2 Total frequencies of epidemiological and reporting characteristics in SRs of effectiveness indexed in MEDLINE (via PubMed), 2000–2019
From: Restrictions and their reporting in systematic reviews of effectiveness: an observational study
Characteristics * | Total (n = 535) |
|---|---|
Journals | |
Cochrane Database Syst Rev | 81/535 (15.1%) |
PLoS One | 14/535 (2.6%) |
Medicine (Baltimore) | 13/535 (2.4%) |
Other | 427/535 (79.8%) |
Years | |
2000–2004 | 25/535 (4.7%) |
2005–2009 | 50/535 (9.4%) |
2010–2014 | 136/535 (25.4%) |
2015–2019 | 324/535 (60.6%) |
Country of corresponding author | |
USA | 89/535 (16.6%) |
China | 88/535 (16.5%) |
UK | 72/535 (13.5%) |
Australia | 54/535 (10.1%) |
Canada | 37/535 (6.9%) |
Netherlands | 34/535 (6.4%) |
Other | 161/535 (30.1%) |
Number of authors | |
Mean (SD) | 5.2 (2.5) |
Median [IQR] | 5 [3–7] |
Number of databases searched | |
1 | 44/535 (8.2%) |
2 | 69/535 (12.9%) |
3 + | 422/535 (78.9%) |
Included articles (n = 534) | |
Mean (SD) | 20.8 (26.6) |
Median [IQR] | 13 [7–25] |
Meta-analysis performed (n = 529) | 348/529 (65.8%) |
Number of included studies reported (n = 333) | 333/348 (95.7%) |
Mean (SD) | 9.0 (8.0) |
Median [IQR] | 6 [4–11] |