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Table 1 Study characteristics

From: Characteristics and knowledge synthesis approach for 456 network meta-analyses: a scoping review

Study characteristics (n = 456)   Count (%)
Year of publication 1999–2002 3 (0.7)
2003–2006 21 (4.6)
2007–2010 77 (16.9)
2011–2014 306 (67.1)
2015 (until April) 49 (10.7)
Geographic region Europe 234 (51.3)
North America 140 (30.7)
Asia 67 (14.7)
Central & South America 6 (1.3)
Australia & New Zealand 7 (1.5)
Africa 2 (0.4)
Knowledge synthesis approach Systematic review 365 (80.0)
Overview of reviews 8 (1.8)
Narrative review 1 (0.2)
Not reported 82 (18.0)
Review duration (month) <6 months 55 (12.1)
6–12 months 132 (28.9)
>12–24 months 106 (23.2)
>24 months 81 (17.8)
Not reported 82 (18.0)
Funding Publicly-sponsored 165 (36.2)
Industry-sponsored 100 (21.9)
Non-sponsored 101 (22.1)
Industry and publicly sponsored 8 (1.8)
Funding source not reported 82 (18.0)
Full review method reporteda Yes 438 (96.1)
No 18 (3.9)
Number of trials included in review Median (IQR) 25 (14–48)
Number of trials included in the network Median (IQR) 21 (13–40)
  1. aNMAs without full review method were those with inadequate reporting of review methods (i.e., literature search, study selection, data abstract and quality assessment)
  2. IQR interquartile range