Lifestyle and Clinical Risk Factors for Incident Rheumatoid Arthritis-associated Interstitial Lung Disease

Area of Science:

• Rheumatology
• Pulmonology
• Epidemiology

Background:

• Rheumatoid arthritis (RA) can lead to interstitial lung disease (ILD), a serious complication.
• Identifying risk factors for RA-ILD is crucial for early intervention and prevention.

Purpose of the Study:

• To investigate the association between lifestyle factors and the risk of developing RA-ILD.
• To determine the smoking threshold that elevates RA-ILD risk.
• To quantify the predictive value of known lifestyle and clinical factors for RA-ILD.

Main Methods:

• A nested case-control study design was employed.
• RA-ILD cases were matched with RA non-ILD controls based on key demographic and clinical variables.
• Logistic regression models and Area Under the Curve (AUC) analysis were used to assess risk and predictive ability.

Main Results:

• Obesity, high CRP levels (≥ 10 mg/L), and poor functional status were associated with increased RA-ILD risk.
• Smoking 30 pack-years or more showed a strong association with higher RA-ILD risk.
• The combined lifestyle and clinical factors demonstrated a predictive ability for RA-ILD with an AUC of 0.79.

Conclusions:

• Obesity, elevated CRP, impaired functional status, and extensive smoking are identified as potential novel risk factors for RA-ILD.
• These factors may aid in the risk assessment and prevention strategies for RA-ILD.
• The overall predictive capability for RA-ILD remains moderate.