Table 2.
Characteristics of included studies reported the prevalence of COPD in RA
| 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 |
NA Not available, Y Year