Table 1.

General characteristics of adults ≥ 65 years receiving invasive mechanical ventilation

	With dementia	Without dementia	OR (95%CI)	p value
	5770 (2.2)	253,853 (97.8)
Gender women	2702 (46.8)	96,946 (38.2)	1.43 (1.35, 1.50)	< 0.001
Age
65–74 years	1787 (31.0)	131,717 (51.9)	Ref.
75–84 years	3166 (54.9)	108,990 (42.9)	2.14 (2.02, 2.27)	< 0.001
> 84 years	817 (14.1)	13,146 (5.2)	4.58 (4.21, 4.99)	< 0.001
Charlson Index score
0 points	1891 (32.8)	77,478 (30.5)	Ref.
1–2 points	2932 (50.8)	124,467 (49.0)	0.97 (.91, 1.02)	0.235
3–4 points	734 (12.7)	37,678 (14.8)	0.80 (0.73, 0.87)	< 0.001
> 4 points	213 (3.7)	14,230 (5.6)	0.61 (0.53, 0.71)	< 0.001
Main Charlson comorbidities
Diabetes	1476 (25.6)	59,879 (23.6)	1.10 (1.03, 1.14)	< 0.001
Cerebrovascular disease	1048 (18.2)	18,972 (7.5)	2.75 (2.57, 2.94)	< 0.001
COPD	1005 (17.4)	54,918 (21.6)	0.76 (0.71, 0.82)	< 0.001
Heart failure	836 (14.5)	47,921 (18.9)	0.73 (0.68, 0.78)	< 0.001
ICD-9-CM main diagnosis
Circulatory	1751 (30.3)	98,683 (38.9)	0.69 (0.65, 0.73)	< 0.001
Respiratory	984 (17.0)	39,379 (15.5)	1.12 (1.04, 1.20)	0.001
Injury-poisoning	910 (15.8)	27,338 (10.8)	1.55 (1.44, 1.67)	< 0.001
Digestive	805 (14.0)	29,621 (11.7)	1.23 (1.14, 1.32)	< 0.001
Cancer	364 (6.3)	29,229 (11.5)	0.52 (0.47, 0.58)	< 0.001
No. of hospital beds
< 200	691 (12.0)	26,929 (10.6)	Ref
200–500	1927 (33.4)	71,698 (28.2)	1.05 (0.96, 1.14)	0.302
501–1000	1774 (30.8)	87,898 (34.6)	0.79 (0.72, 0.86)	< 0.001
> 1000	1378 (23.9)	67,327 (26.5)	0.80 (0.73, 0.87)	< 0.001
DRG surgical	2455 (42.6)	145,001 (57.2)	0.56 (0.53, 0.59)	< 0.001
Mechanical ventilation ≥ 96 h	1729 (30.0)	85,162 (33.6)	0.85 (0.80, 0.90)	< 0.001
In-hospital mortality (CFR)	2992 (51.9)	123,445 (48.6)	1.14 (1.08, 1.20)	< 0.001

Data presented as number of cases (%)

OR odds ratio, CI confidence interval, COPD chronic obstructive pulmonary disease, DRG diagnosis-related group, CRF case fatality rate