Fig. 2

Forrest plots of the meta-analysis for age, male sex, smoking history and DLCO% predicted, FVC% predicted and CPI. Forest plots of HRs for the correlation of age with mortality in RA-ILD (A). Forest plot of HRs for the correlation of male sex with mortality in RA-ILD (B). Forest plot of HRs for the correlation of having a smoking history with mortality in RA-ILD (C). Forest plot of HRs for the correlation of DLCO% predicted with mortality in RA-ILD (D). Forest plot of HRs for the correlation of FVC% predicted with mortality in RA-ILD (E). Forest plot of HRs for the correlation of CPI with mortality in RA-ILD (F). HRs hazard ratios; RA-ILD rheumatoid arthritis-associated interstitial lung disease; DLCO diffusing capacity of the lung for carbon monoxide; FVC forced vital capacity; CPI composite physiological index