Risk Factors for Hospital and Long-Term Mortality of Critically Ill Elderly Patients Admitted to an Intensive Care Unit

Table 1

Baseline characteristics.

Characteristics	Total ()	Age (year)		value
		<65 ()	≥65 ()
Gender				<0.001
Male	957 (61.2)	567 (66.4)	390 (55.0)
Female	606 (38.8)	287 (33.6)	319 (45.0)
Race				<0.001
Chinese	913 (58.4)	424 (49.7)	489 (69.0)
Malay	376 (24.1)	228 (26.7)	148 (20.9)
Indian	163 (10.4)	118 (13.8)	45 (6.4)
Others	111 (7.1)	84 (9.8)	27 (3.8)
Comorbidities				<0.001
0-1	468 (30.2)	395 (46.4)	73 (10.5)
2-3	504 (32.5)	284 (33.4)	220 (31.5)
>3	577 (37.3)	172 (20.2)	405 (58.0)
Diagnosis
Sepsis
Pulmonary	391 (25.1)	214 (25.1)	177 (25.1)	0.983
Others	103 (6.6)	68 (8.0)	35 (5.0)	0.017
Organ-specific disease
Hepatic	108 (6.9)	57 (6.7)	51 (7.2)	0.680
Neurological	105 (6.7)	67 (7.2)	44 (6.2)	0.467
Renal	80 (5.1)	38 (4.5)	42 (6.0)	0.185
Cardiovascular	74 (4.8)	31 (3.6)	43 (6.1)	0.023
Endocrine	46 (3.0)	37 (4.3)	9 (1.3)	<0.001
Pulmonary, airway	131 (8.4)	45 (5.3)	86 (12.2)	<0.001
Pulmonary, others^‡	36 (2.3)	19 (2.2)	17 (2.4)	0.816
Malignancy				0.006
Hematological	68 (4.4)	49 (5.8)	19 (2.7)
Nonhematological	61 (3.9)	28 (3.3)	33 (4.7)
Others	193 (12.4)	135 (15.9)	58 (8.2)	<0.001
Treatment
Mechanical ventilation	986 (63.1)	522 (61.1)	464 (65.4)	0.078
Noninvasive ventilation	620 (39.7)	273 (32.0)	347 (49.0)	<0.001
Vasopressor	745 (47.7)	414 (48.5)	331 (46.7)	0.480
Packed cell transfusion	437 (28.0)	253 (29.6)	184 (26.0)	0.107
Renal replacement therapy				0.003
Preexisting	149 (9.6)	79 (9.3)	70 (9.9)
New cases	157 (10.1)	106 (12.5)	51 (7.2)
CPR prior to admission	81 (5.2)	39 (4.6)	42 (5.9)	0.246

CPR: cardiopulmonary resuscitation.
Specifically obstructive sleep apnea and restrictive lung diseases.