Table 4.

Unadjusted analysis regarding long-term mortality (until December 31, 2020) for critically ill patients aged ≥ 70 years and discharged alive at index (n = 303)

Variable	Prevalence n (%)	Unadjusted HR (95% CI)	p-value
CCI > 2	95 (31.4)	1.86 (1.43–2.42)	< 0.0001
Age; mean (SD)	81.7 (6.3)	1.07 (1.05–1.09)	< 0.0001
Female sex	138 (45.5)	1.06 (0.82–1.35)	0.66
ICU/cICU	59 (19.5)	0.88 (0.64–1.20)	0.42
LOS > 7 days	177 (58.4)	1.84 (1.42–2.37)	< 0.0001
Diagnosis at discharge
Pneumonia	64 (21.1)	1.57 (1.17–2.09)	0.002
Heart failure	26 (8.6)	1.44 (0.94–2.22)	0.10
Atrial fibrillation	21 (6.9)	0.42 (0.24–0.76)	0.004
COPD	19 (6.3)	1.45 (0.91–2.32)	0.12
Urosepsis	23 (7.6)	0.80 (0.49–1.29)	0.33
Symptoms on admissiona
Dyspnea	148 (48.8)	1.48 (1.16–1.89)	0.002
Unconsciousness	33 (10.9)	1.24 (0.84–1.81)	0.28
Chest pain	39 (12.9)	0.72 (0.49–1.06)	0.10
Seizure attack	15 (5.0)	1.03 (0.58–1.84)	0.91
Vomiting	19 (6.3)	0.94 (0.58–1.54)	0.81
Vital signs on admission
Obstructive airway	17 (5.6)	1.05 (0.62–1.76)	0.87
Hypoxiab (5)c	153 (51.3)	1.99 (1.55–2.56)	< 0.0001
Hypotensiond (2)	40 (13.3)	1.05 (0.73–1.51)	0.78
Respiratory rate (br/min), ≤ 8/ ≥ 30 (35)	152 (56.7)	1.58 (1.20–2.07)	0.001
Heart rate (bpm), ≥ 130/ ≥ 150e (1)	69 (22.8)	0.56 (0.41–0.77)	0.0003
RLS > 3	38 (12.5)	1.08 (0.74–1.56)	0.69
Ongoing seizure attack	13 (4.3)	1.09 (0.60–2.00)	0.77
Signs of infection	111 (36.6)	0.95 (0.74–1.23)	0.71
Admission time point
Workday 8 am—8 pm	143 (47.2)	0.73 (0.57–0.94)	0.01

Three hundred three patients were included in the analysis. There were two hundred fifty-four deaths

CCI Charlson Comorbidity Index, ICU intensive care unit, cICU coronary intensive care unit, LOS length of stay, COPD chronic obstructive pulmonary disease, br/min breaths per minute, bpm beats per minute, RLS Reaction Level Scale

^aFive most commonly reported main symptoms in the ambulance

^bOxygen saturation < 90%

^cNumber missing

^dSystolic blood pressure < 90 mmHg

^eRegular/irregular