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Table 1 Characteristics of included studies reported the risk of COPD in RA

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

Author Year Region Number of cases Number of controls Age of cases(Y) Age of controls(Y) Female proportion (%) Follow up duration(Y) Quality
Sparks JA [17] 2017 America 843 8399 59.8 59.8 100.0 7.0 9
Mcguire K [18] 2017 Canada 24625 25396 57.2 57.3 67.0 18.6 9
Hemminki K [26] 2011 Sweden NA NA NA NA NA NA 6
Nannini C [15] 2013 America 594 596 57.8 58.2 73.4 16.3 9
Ursum J [27] 2013 Netherlands 3356 6708 55.0 55.0 63.7 2.8 8
Shen TC [28] 2014 China 28725 114900 53.8 53.2 78.0 5.1 9
  1. NA Not available, Y year