Univariate binary logistic regression analysis of RA-ILD and RA-non ILD
| Factors | RR | 95% CI | P |
|---|---|---|---|
| Age, year, mean (SD) | 1.06 | 1.01–1.12 | 0.04 |
| Smoking, n (%) | 1.02 | 0.13–8.20 | 0.99 |
| Disease duration, median (IQR) | 1.02 | 0.96–1.09 | 0.46 |
| DAS28-ESR score, mean (SD) | 1.06 | 0.58–1.93 | 0.86 |
| HAQ score, median (IQR) | 3.05 | 1.25–7.45 | 0.02 |
| Breathlessness, n (%) | 57.08 | 11.59–281.23 | < 0.001 |
| Basal crackles, n (%) | 248.42 | 44.93–1,373.60 | < 0.001 |
DAS28-ESR: Disease Activity Score in 28 joints using Erythrocyte Sedimentation Rate; HAQ: Health Assessment Questionnaire; IQR: interquartile range; ESR: erythrocyte sedimentation rate; ILD: interstitial lung disease; RA: rheumatoid arthritis; RR: relative risk