Table 1.

Results of the first-stage feature selection by logistic regression.

Item	Variablesa	All patients N = 83,227	Estimate	Std. error	z value	Prob( >|z|)
0	(Intercept)		− 3.909283	0.037019	− 105.601	< 0.000
1	Age (mean ± SD)	51.08 ± 30.49	0.031406	0.000562	55.882	< 0.000
2	Heart disease	21,776 (26.16%)	0.448181	0.021741	20.615	< 0.000
3	Metastatic cancer	4264 (5.12%)	0.663727	0.037349	17.771	< 0.000
4	CVA	16,935 (20.35%)	0.361054	0.022895	15.77	< 0.000
5	Renal disease	6617 (7.95%)	0.429659	0.029803	14.417	< 0.000
6	Neurological disease	8443 (10.14%)	0.36544	0.028077	13.016	< 0.000
7	Diabetes	16,416 (19.72%)	0.280035	0.022435	12.482	< 0.000
8	Pulmonary disease	32,646 (39.23%)	− 0.243137	0.021165	− 11.488	< 0.000
9	Gender (male)	49,739 (59.76%)	0.227208	0.020821	10.912	< 0.000
10	Hypertension	30,663 (36.84%)	− 0.182299	0.02258	− 8.073	< 0.000
11	Tuberculosis	3083 (3.7%)	0.332174	0.042151	7.881	< 0.000
12	Cancer without metastasis	4113 (4.94%)	0.28759	0.038312	7.506	< 0.000
13	Leukemia and lymphoma	922 (1.11%)	0.565562	0.082878	6.824	< 0.000
14	Pregnancy/postpartum	334 (0.4%)	1.006209	0.167368	6.012	< 0.000
15	PVD	1689 (2.03%)	0.253768	0.05406	4.694	< 0.000
16	AIDS	63 (0.08%)	1.223306	0.306994	3.985	< 0.000
17	Severe liver disease	289 (0.35%)	0.496771	0.142543	3.485	0.000
18	Autoimmune disease	635 (0.76%)	0.262207	0.104528	2.508	0.012
19	Mental illness	1821 (2.19%)	0.100714	0.065314	1.542	0.123
20	Hypothyroidism	558 (0.67%)	0.137819	0.100471	1.372	0.170
21	Hyperthyroidism	542 (0.65%)	0.061082	0.112777	0.542	0.588

CVA cerebrovascular accident, PVD peripheral vascular disease, AIDS acquired immune deficiency syndrome.