. 2015 Oct 20;16(5):696–706. doi: 10.5811/westjem.2015.6.25736

Table 1.

Demographic and clinical characteristics of invasive mechanical ventilation (IMV) discharges in California, 2000–2009.

Characteristic	All patients from 2000–2009 (n=696,634)^#	2000^*	2009^*
Age strata
18–34 (yrs)	47,371 (6.8)	4	6
35–64 (yrs)	266,114 (38.2)	19	32
≥65 (yrs)	382,452 (54.9)	33	42
Gender,
Female, reference	328,115 (47.1)	27	37
Male	368,519 (52.9)	29	43^a
Race/ethnicity
White, reference	406,138 (58.3)	36	43
Hispanic	100,315 (14.4)	7	13^a
Black	57,124 (8.2)	4	7^a
Asian	39,012 (5.6)	3	5^a
Other	11,843 (1.7)	1	2^a
Unknown	82,203 (11.8)	6	10^a
Type of insurance
Medicare, reference	385,935 (55.4)	32	44
Non-Medicare public	138,630 (19.9)	10	17^a
Private	133,057 (19.1)	12	15^a
Other	39,012 (5.6)	3	5^a
Charlson co-morbidity index
0, reference	101,709 (14.6)	8	11
1–2	345,530 (49.6)	30	38 ^a
3+	249,395 (35.8)	17	31 ^a
Surgery
No, reference	453,509 (65.1)	36	53
Yes	243,125 (34.9)	20	27^a
Urban vs. rural
Urban, reference	665,285 (95.5)	53	77
Rural	20,899 (3)	2	2
Unknown	10,450 (1.5)	1	1
Mechanical ventilation time
<96 hours, reference	413,801 (59.4)	35	47^a
≥96 hours	282,833 (40.6)	21	33

Displayed as count (column percent).

Displayed as number of patients per 1,000 IMV discharges. All counts for the year 2000 are population adjusted relative to all 2009 hospitalizations in the California population.

P-values<0.01 based on logistic regression models comparing 2009 discharges with 2000, for all discharges and within each age group.