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Baseline characteristics at intensive care unit admission stratified by study period |
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| Clinical characteristic |
Period I (n = 2,366) 1 Mar 01 to 28 Feb 02 |
Period II (n = 3,322) 1 Mar 02 to 30 Jun 03 |
Period III (n = 4,786) 1 Jul 03 to 28 Feb 05 |
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| Age in years, mean ± SD |
51.1 ± 18.5 |
51.6 ± 19.1 |
51.6 ± 19.0 |
| Male gender, n (%) |
1,467 (62.0) |
2,071 (62.4) |
3,044 (63.9) |
| Race or ethnic group, n (%)a |
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| Native American |
70 (2.96) |
62 (1.87) |
105 (2.20) |
| Asian |
142 (6.00) |
220 (6.63) |
294 (6.17) |
| African-American |
224 (9.47) |
291 (8.77) |
369 (7.74) |
| Caucasian |
1,651 (69.78) |
2,310 (69.60) |
3,422 (71.77) |
| Hispanic |
91 (3.85) |
156 (4.70) |
228 (4.78) |
| Unknown |
188 (7.95) |
283 (8.52) |
350 (7.34) |
| History of diabetes, n (%) |
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| Type I |
64 (2.7) |
68 (2.1) |
77 (1.6) |
| Type II |
211 (8.92) |
367 (11.1) |
574 (12.0) |
| History of chronic disease, n (%)b |
74 (3.2) |
95 (2.9) |
137 (2.9) |
| SAPS II, mean ± SDc |
39.1 ± 18.1 |
39.3 ± 18.9 |
37.2 ± 18.4 |
| APS III, mean ± SDd |
53.1 ± 21.8 |
53.1 ± 23.3 |
50.5 ± 23.3 |
| Trauma patients, n (%) |
857 (36) |
1,203 (36) |
1,920 (40) |
| Injury Severity Score, mean ± SD |
21.2 ± 10.9 |
20.8 ± 11.1 |
20.7 ± 10.6 |
| Type of admission, n (%) |
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| Surgical admission |
1,440 (60.9) |
2,003 (60.3) |
3,084 (64.7) |
| Medical admission |
926 (39.1) |
1,319 (39.7) |
1,684 (35.3) |
| Admitting service, n (%) |
n = 2,366 |
n = 3,314 |
n = 4,745 |
| Surgical ICU |
759 (32.1) |
1,061 (32.0) |
1,604 (33.8) |
| Medical ICU |
756 (31.9) |
1,025 (30.9) |
1,303 (27.5) |
| Coronary ICU |
170 (7.19) |
270 (8.2) |
350 (7.4) |
| Neurosurgical ICU |
607 (25.7) |
871 (26.3) |
1,335 (28.1) |
| Burn ICU |
74 (3.1) |
87 (2.6) |
153 (3.2) |
| Weight in kilograms, mean ± SD |
83.0 ± 24.9 |
84.6 ± 26.0 |
84.5 ± 25.5 |
| Admission glucose in mg/dL, mean ± SD |
162.5 ± 88.9 |
161.3 ± 82.5 |
152.1 ± 69.1 |
| Mechanical ventilation, n (%) |
1,424 (60.2) |
1,878 (56.5) |
2,578 (54.1) |
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aRace or ethnic group was assigned on the basis of hospital record. bChronic disease defined according to Simplified Acute Physiology Score (SAPS) II criteria. cSAPS II can range from 0 to 162, with higher scores indicating a higher risk of death. dAPS is the acute physiology score of the APACHE (Acute Physiology and Chronic Health Evaluation) III score; it can range from 0 to 251, with higher scores indicating a higher risk of death. ICU, intensive care unit; SD, standard deviation. | |||
Treggiari et al. Critical Care 2008 12:R29 doi:10.1186/cc6807 |
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