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Table 2 Characteristics of included studies reported the prevalence of COPD in RA

From: Chronic obstructive pulmonary disease in rheumatoid arthritis: a systematic review and meta-analysis

Author Year Region Number of patients Age (Y) Female proportion (%) Smoker proportion (%) Disease duration (Y) Quality
Bieber V [29] 2013 Israel 9039 60.1 77.9 28.9 NA 7
Carmona L [30] 2011 Spain 3320 59.0 79.2 14.9 10.3 6
Liao TL [31] 2016 China 42180 53.4 78.6 NA NA 6
Aurrecoechea E [32] 2016 Spain 140 51.4 50.0 28.6 81.9 5
Lacaille D [33] 2017 Canada 14116 57.5 66.6 NA 0.4 9
Curtis JR [34] 2015 America 13296 52.6 81.9 NA NA 5
Lunt M [35] 2010 England 16194 57.9 73.4 22.3 9.9 7
Dougados M [2] 2013 Multination 3920 56.0 81.7 13.2 9.6 9
  1. NA Not available, Y Year