Table 2. Univariate and multivariate analyses for death.

	Univariate			Multivariate
	OR	95%CI	P values	OR	95%CI	P values
Age year
<65	reference			reference
65≤	3.32	1.36–8.10	0.008	8.68	2.26–33.48	0.002
Diagnosis
Non-RA	reference			reference
RA	0.35	0.15–0.82	0.016	0.62	0.14–2.80	0.538
Presence of lung involvement	5.97	2.19–16.23	<0.001	4.35	1.36–13.91	0.013
Lymphocyte count /μl
1500≤	reference			reference
500–1500	7.33	0.87–61.33	0.066	5.43	0.53–56.19	0.155
<500	19.25	2.20–168.00	0.007	29.92	2.42–370.68	0.008
Dose of daily prednisolone (per 10mg increase)	1.66	1.16–2.37	0.005	1.47	0.82–2.66	0.194
Use of biologics	0.36	0.11–1.21	0.099	0.86	0.16–4.84	0.873

RA: rheumatoid arthritis; OR: odds ratio; CI: confidence interval