Table 1

Characteristics of 2981 survey participants from two population-based samples

Characteristics2017
Sample
2019
Sample
Combined
Samples
(n=973)(n=2008)(n=2981)
Sociodemographicsn(%) (unless otherwise noted)
 Age, mean±SD66.0±9.666.9±9.766.6±9.7
 Race/ethnicity
  Black31 (3%)48 (2%)79 (3%)
  Hispanic16 (2%)24 (1%)40 (1%)
  Asian/other38 (4%)61 (3%)99 (3%)
  White, non-Hispanic888 (91%)1875 (93%)2763 (93%)
 Currently employed407 (42%)716 (36%)1123 (38%)
Cigarette Smoking
 Never smoked452 (46%)845 (42%)1297 (44%)
 Former smoker394 (40%)832 (41%)1226 (41%)
 Current/recent smoker127 (13%)331 (16%)458 (15%)
 Among ever smokers
  Years smoked, median (IQR)25 (12–40)25 (13–40)25 (12–40)
  Pack-years, mean±SD29.8±28.832.0±30.331.3±29.8
Arthritis
No dx of arthritis reported456 (47%)837 (42%)1293 (43%)
Any arthritis dx reported517 (53%)1171 (58%)1688 (56%)
 Arthritis, excluding RA329 (34%)759 (38%)1088 (37%)
 Any RA reported188 (19%)412 (21%)600 (20%)
 RA, with glucocorticoids112 (12%)202 (10%)314 (11%)
 RA, with DMARD88 (4%)
 RA, with DMARD and glucocorticoids62 (3%)
Exposures
Any coal mining exposure181 (19%)409 (20%)590 (20%)
 Years coal mining, median (IQR)19 (7–30)17 (5–30)18 (5–30)
 Underground mining133 (14%)263 (13%)396 (13%)
 Surface mining97 (10%)210 (10%)307 (10%)
 High intensity silica coal mining jobs258 (13%)
Silica exposure, not from coal mining264 (27%)557 (28%)821 (28%)
Ergonomic exposure score, median (IQR)2 (0–3)
 Ergonomic score=0613 (31%)
 Ergonomic score=1326 (16%)
 Ergonomic score=2–3613 (31%)
 Ergonomic score=4–5456 (23%)
  • All participants male, ≥50 years old. Missing data for years smoking: 14 (2017), 23 (2019); see the Methods section for drugs included.

  • DMARD, disease-modifying antirheumatic drug; RA, rheumatoid arthritis.