Identification of high-risk subgroups in very elderly intensive care unit patients

Table 1 Characteristics of patients surviving or not surviving until hospital discharge (developmental set)

Variable	Survivors (n = 3,145)	Non-survivors (n = 1,433)	p value^a
Age in years^b	83.2 ± 3.3	83.6 ± 3.4	< 0.05
Male	45.7%	47.8%	0.554
Maximum temperature in degrees Celsius^b	37.5 ± 0.82	37.4 ± 1.37	0.397
Heart rate in beats per minute^b	69.6 ± 16.7	67.4 ± 29.1	0.0107
Sodium in millimoles per liter^b	137 ± 4.5	137 ± 5.87	0.00329
Potassium in millimoles per liter^b	3.7 ± 0.544	3.78 ± 0.739	< 0.001
Creatinine in micromoles per liter^b	104 ± 71.8	143 ± 105	< 0.001
Bicarbonate in millimoles per liter^b	21.4 ± 4.02	18.7 ± 5.53	< 0.001
Albumin in grams per liter^b	22.3 ± 6.8	20 ± 7.71	< 0.001
pH^b	7.38 ± 0.0837	7.32 ± 0.124	< 0.001
Urine output in liters per 24 hours^b	2.65 ± 2.02	1.75 ± 1.78	< 0.001
Glasgow Coma Scale
Score = 15	2,950	1,029	< 0.05
Score less than 15	195 (6.2%)	404 (28.2%)
APACHE II score^b	16.7 ± 5.46	22.5 ± 8.16	< 0.001
APACHE II predicted mortality^b	0.197 ± 0.178	0.432 ± 0.262	< 0.001
SAPS II score^b	36.2 ± 12.1	54.2 ± 20.4	< 0.001
SAPS II predicted mortality^b	0.219 ± 0.193	0.513 ± 0.305	< 0.001
Cardiopulmonary resuscitation before admission	2.7%	15.2%	< 0.001
Length of stay at intensive care unit in days^c	1.0 (0.8–2.9)	1.9 (0.7–5.7)	< 0.001
Length of stay at hospital in days^c	14 (9–25)	10 (3.2–24)	0.04

^ap value less than 0.05 is significant; ^bmean ± standard deviation; ^cmedian (interquartile range). APACHE II, Acute Physiology and Chronic Health Evaluation II; SAPS II, Simplified Acute Physiology Score II.

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