Table 1.
Characteristics of study population at registry enrollment by interstitial lung disease (ILD) status.
| N | Total (N=2561) |
RA-ILD (N=238) |
RA no-ILD (N=2323) |
p value | |
|---|---|---|---|---|---|
| Age, years | 2560 | 69.4 (10.8) | 72.0 (9.0) | 69.2 (10.9) | <0.001 |
| Male sex, n (%) | 2557 | 2275 (89.0) | 225 (94.5) | 2050 (88.4) | 0.004 |
| Race and ethnicity, n (%) | 2556 | 0.36 | |||
| Black/African American | 417 (16.3) | 44 (18.5) | 373 (16.1) | ||
| White | 1962 (76.7) | 174 (73.1) | 1788 (77.1) | ||
| Other* | 177 (6.9) | 20 (8.4) | 157 (6.8) | ||
| BMI category, n (%) | 2545 | 0.73 | |||
| Underweight (<20 kg/m2) | 84 (3.3) | 6 (2.5) | 78 (3.4) | ||
| Normal (20-24.9 kg/m2) | 479 (18.8) | 50 (21.2) | 429 (18.6) | ||
| Overweight (25-29.9 kg/m2) | 920 (36.1) | 84 (35.6) | 836 (36.2) | ||
| Obese (>30 kg/m2) | 1062 (41.7) | 96 (40.7) | 966 (41.8) | ||
| Smoking history (ever), n (%) | 2560 | 1989 (77.7) | 204 (85.7) | 1785 (76.9) | 0.002 |
| RA disease duration, years | 2507 | 10.1 (11.2) | 11.1 (12.1) | 10.0 (11.2) | 0.42 |
| Anti-CCP positive, n (%) | 2419 | 1874 (77.5) | 192 (84.2) | 1682 (76.8) | 0.01 |
| DAS28 | 2522 | 3.23 (1.08) | 3.48 (1.10) | 3.21 (1.07) | <0.001 |
Values mean (SD) unless otherwise noted. P values by chi-square or independent t-test.
*
Other includes Asian American, American Indian/Pacific Islander, and Hispanic.
BMI = body mass index; Anti-CCP = anti-cyclic citrullinated protein antibody; DAS-28 = disease activity score (28 joints).