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Table 1 Characteristics of included IPD-NMAs

From: Statistical analyses and quality of individual participant data network meta-analyses were suboptimal: a cross-sectional study

Items Frequency Proportion (%)
Publication year
 2007 1 4.8
 2010 1 4.8
 2011 1 4.8
 2012 5 23.8
 2013 1 4.8
 2014 4 19.0
 2015 2 9.5
 2017 3 14.3
 2018 2 9.5
 2019 1 4.8
Country of the correspondence author
 USA 9 42.9
 UK 7 33.3
 France 3 14.3
 Cameroon 1 4.8
 Netherland 1 4.8
Journal impact factor
 0.0 to 3.0 6 28.6
 3.1 to 6.0 5 23.8
 6.1 to 15.0 2 9.5
 > 15.0 6 28.6
 Non-SCI 2 9.5
Number of authors
 1 to 3 authors 0 0
 4 to 6 authors 8 38.1
 7 to 10 authors 5 23.8
 11 or more authors 8 38.1
With statistician or epidemiologist 7 33.3
Authors from 2 or more countries 15 71.4
With a priori protocol 6 28.6
Format of data
 IPD only 11 52.4
 IPD + AD 10 47.6
Number of RCTs included: median (IQR) 19 (9, 26)  
Number of samples included: median (IQR) 7110 (4906.5, 14261)  
Number of interventions included: median (IQR) 6 (4,7)  
Funding sources
 Industry 6 28.6
 Non-industry 11 52.4
 Industry + non-industry 3 14.3
 Unfunded 1 4.8
  1. SCI science citation index, IPD individual participant data, AD aggregate data, IQR interquartile range