. Author manuscript; available in PMC: 2014 Aug 1.

Published in final edited form as: Arthritis Care Res (Hoboken). 2013 Aug;65(8):1243–1250. doi: 10.1002/acr.21986

Table 2.

Demographic and clinical characteristics

	Patients with RA (N=594)	Subjects without RA (N=596)	P value
Age at RA diagnosis/index date, mean ± SD	57.8 ± 15.2	58.2 ± 15.3	0.71
Years of follow up, mean ± SD	16.3 ± 10.5	19.4 ± 11.1	--
Female (n, %)	435 (73.2%)	438 (73.5%)	0.92
Smoking status			0.01^*
Current smoker (n,%)	169 (28.5%)	142 (23.8%)
Former smoker (n,%)	140 (23.6%)	117 (19.6%)
Pulmonary function available (n,%)^*	114 (19.2%)	97 (16.3%)	0.18
Chest x-ray available (n,%)^*	585 (98.5%)	582 (97.7%)	0.40
Comorbidities (n,%)
Alcoholism
baseline	12 (2.0%)	17 (3.0%)	0.28
ever	41 (6.9%)	26 (4.6%)	--
Diabetes
baseline	43 (7.2%)	40 (6.7%)	0.72
ever	111 (18.7%)	143 (24.0%)	--
Obesity
baseline	71 (12.8%)	65 (12.2%)	0.75
ever	136 (22.9%)	140 (23.5%)	--
Heart disease^†
baseline	76 (12.8%)	72 (12.1%)	0.71
ever	281 (47.3%)	233 (47.3%)	--

multigroup comparison never vers. current vers. former smoker;

^†

ever preformed until last date of follow up;

^††

angina pectoris, coronary artery disease, coronary insufficiency, ischemic heart disease, myocardial infarction, heart failure, pulmonary edema and coronary revascularization procedures. SD: standard deviation; N: number of subjects; %: percentage