Risk Prediction of One-Year Mortality in Patients with Cardiac Arrhythmias Using Random Survival Forest

Table 1

Baseline characteristics of dead and alive patients during one-year followup.

Characteristics	Dead	Alive	value
	3452	7036
Demographics
Age, years	75.32 (12.84)	71.94 (23.596)	<0.001
Gender, male	59%	57%	0.1
BMI, kg/m^2	22.76 (102)	33.48 (2588)	<0.001
Clinical variables
Arrhythmias type
CA	518 (15%)	352 (5%)	<0.001
VF	138 (4%)	211 (3%)	0.459
VT	390 (11%)	844 (12%)	0.095
AF	2727 (79%)	5488 (78%)	0.281
Slow arrhythmias	276 (8%)	1055 (15%)	<0.001
HF	1484 (43%)	2110 (30%)	<0.001
Myocardial infraction	621 (18%)	1266 (18%)	0.867
Bundle branch block	18 (0.5%)	38 (0.6%)	0.168
Valvular heart diseases	517 (15%)	915 (13%)	0.088
Stroke	424 (12%)	633 (9%)	0.01
Hypertension	932 (27%)	2251 (32%)	<0.001
Acute pulmonary heart disease	79 (2%)	141 (2%)	0.238
Chronic pulmonary heart disease	178 (5%)	352 (5%)	0.277
Uncomplicated diabetes	690 (20%)	1547 (22%)	0.001
Complicated diabetes	242 (7%)	352 (5%)	0.001
Hypothyroidism	345 (10%)	704 (10%)	0.143
Renal failure	483 (14%)	422 (6%)	<0.001
Liver disease	138 (4%)	141 (2%)	<0.001
Laboratory variables
K, mEq/L	4.81 (0.89)	4.96 (0.94)	<0.001
NA, mEq/L	139.21 (4.25)	138.85 (2.93)	<0.001
WBC, K/μL	19.79 (13.88)	16.1 (8.13)	<0.001
RBC, K/μL	4.09 (0.75)	4.15 (0.58)	<0.001
ALT, IU/L	185.57 (659)	87.54 (372)	<0.001
AST, IU/L	345.31 (1388)	125.49 (631)	<0.001
CKPK, IU/L	711.67 (4944)	532.99 (2061)	0.017
SCR, mg/dL	2.49 (2.03)	1.8 (1.76)	<0.001
BUN, mg/dL	56.64 (34.15)	38.68 (26.22)	<0.001
Glucose, mg/dL	196.91 (85.41)	187.57 (58.71)	<0.001
PT, seconds	22.97 (15.88)	20.78 (12.69)	<0.001
INR	3.29 (5.49)	2.49 (2.88)	<0.001
PTT, seconds	75.79 (47.99)	69.10 (43.64)	<0.001
BR, mg/dL	2.08 (4.66)	1.09 (2.02)	<0.001
Medications
Class I agents	86 (2.4%)	112 (1.6%)	0.006
Class II agents	2481 (72%)	5366 (76%)	<0.001
Class III agents	153 (4.4%)	781 (11%)	<0.001
Class IV agents	810 (23%)	1205 (17%)	<0.001
Class V agents	2255 (65%)	4622 (66%)	0.716