Table 1

Characteristics of RA patients with and without ILD

Incident RA cohort	All patients		Never ILD		Ever ILD
Incident RA cohort	n	%	n	%	n	%
All	31 333	100.0	30 654	100.0	679	100.0
Female	21 775	69.5	21 403	69.8	372	54.8
Male	9558	30.5	9251	30.2	307	45.2
Age at RA diagnosis
≤64 years	18 647	59.5	18 375	59.9	272	40.1
65–74 years	7060	22.5	6831	22.3	229	33.7
≥75 years	5626	18.0	5448	17.8	178	26.2
Mean age at RA diagnosis (SD)	59.3 (16.6)		59.1 (16.7)		66.5 (12.2)
Median age at RA diagnosis	60.8		60.5		67.9
Seropositive
No	17 091	54.5	16 790	54.8	301	44.3
Yes	14 242	45.5	13 864	45.2	378	55.7

ILD, interstitial lung disease; RA, rheumatoid arthritis.