Table 2

Characteristics of persons with rheumatoid arthritis (RA) and prevalent interstitial lung disease from 2007 to 2020

	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020
N	257	632	840	1033	1130	1186	1285	1351	1406	1463	1553	1548	1541	1484
Age, mean, years (SD)	66 (10)	66 (10)	67 (10)	67 (10)	67 (10)	68 (10)	69 (10)	69 (10)	70 (10)	70 (10)	71 (10)	71 (10)	72 (10)	72 (10)
31–50 years	10	8	6	7	6	6	4	3	4	3	3	3	3	2
51–70 years	55	57	57	53	50	48	45	44	42	42	41	41	40	39
>70 years	35	35	36	39	43	47	51	53	54	55	55	56	57	59
Female	67	69	68	68	70	69	68	69	68	67	68	68	69	69
M05: seropositive RA	46	42	43	42	42	43	43	42	43	45	46	47	48	45
Comorbidities
Hypertension	58	60	62	62	63	64	66	67	68	68	69	69	70	70
Coronary heart disease	19	20	21	19	20	20	22	23	24	25	26	26	26	26
Pulmonary hypertension	6	4	4	3	3	4	5	5	5	5	6	6	6	5
Gastrointestinal reflux	11	15	16	16	17	17	18	19	20	20	21	22	23	24
COPD	26	23	20	22	21	22	24	25	27	27	28	29	28	28
Diabetes mellitus	21	22	21	22	23	25	25	25	26	26	27	27	27	26
Asthma	13	12	12	13	13	13	14	15	16	17	18	20	19	19
Specialised care
Rheumatology care	n.a.	66	68	69	67	68	68	67	66	65	65	65	65	62
Pulmonology care	n.a.	39	46	42	40	40	43	44	46	47	50	49	53	53
Outpatient lung diagnostics*
CT	59	63	65	67	68	71	71	72	74	74	74	75	75	75
Bronchoalveolar lavage	6	5	6	6	6	6	6	5	5	6	5	5	5	5
X-ray	90	93	94	95	95	96	96	96	96	96	95	95	95	95
Functional tests	63	62	60	60	59	59	59	59	60	59	59	59	58	57
Biopsy	21	21	22	22	22	23	22	23	23	21	21	21	20	20
Spirometry	39	47	50	52	51	52	52	53	53	53	53	52	52	52
Bronchoscopy	61	53	53	53	53	52	52	53	52	51	50	49	48	48