Table 2.
Relationship Between Clinical Covariates and the Physical and Mental Component Scores Among RA-ILD Patients: Multivariate Analysis
| A. Physical Component Score | |||||||
|---|---|---|---|---|---|---|---|
| Model R2 | Age | FVC% | Sleep Apnea | UCSD SOBQ Score | Fatigue | Weight Loss | Joint Pain or Stiffness |
| 0.02 | −0.07 (0.61) | 0.12 (0.40) | |||||
| 0.09 | −0.07 (0.60) | 0.19 (0.20) | 0.28 (0.06) | ||||
| 0.28 | 0.15 (0.26) | 0.04 (0.78) | −0.54 (<0.01) | ||||
| 0.23 | −0.09 (0.48) | 0.07 (0.58) | −0.47 (<0.01) | ||||
| 0.10 | −0.08 (0.59) | 0.06 (0.68) | −0.29 (0.05) | ||||
| 0.09 | −0.06 (0.66) | 0.19 (0.20) | −0.28 (0.06) | ||||
| 0.37 | 0.10 (0.45) | 0.02 (0.87) | −0.43 (<0.01) | −0.33 (0.02) | |||
| B. Mental Component Score | ||||||||
|---|---|---|---|---|---|---|---|---|
| Model R2 | Age | FVC% | UCSD SOBQ Score | Fatigue | Cough | Heartburn | Weight Loss | Joint Pain or Stiffness |
| 0.00 | 0.06 (0.71) | 0.02 (0.89) | ||||||
| 0.20 | 0.19 (0.19) | −0.06 (0.66) | −0.47 (<0.01) | |||||
| 0.17 | 0.04 (0.77) | −0.02 (0.86) | −0.41 (<0.01) | |||||
| 0.09 | 0.18 (0.25) | 0.09 (0.52) | 0.33 (0.04) | |||||
| 0.06 | 0.03 (0.82) | 0.05 (0.69) | −0.24 (0.11) | |||||
| 0.06 | 0.05 (0.71) | −0.03 (0.82) | −0.25 (0.09) | |||||
| 0.11 | 0.07 (0.62) | 0.10 (0.48) | −0.34 (0.02) | |||||
| 0.28 | 0.14 (0.33) | −0.08 (0.56) | −0.36 (0.02) | −0.31 (0.03) | ||||
| 0.34 | 0.23 (0.12) | 0.02 (0.89) | −0.37 (0.01) | −0.29 (0.04) | 0.25 (0.08) | |||
Data are presented as standardized β coefficients (P value).
RA-ILD = rheumatoid arthritis-associated interstitial lung disease. FVC% = percent predicted forced vital capacity. R2 = coefficient of determination. UCSD SOBQ = University of California, San Diego Shortness of Breath Questionnaire10.