Table 2.
Baseline characteristics of all subjects
| Traditional ICU (n = 1,067), n (%) | Expanded ICU (n = 899), n (%) | P Value | |
|---|---|---|---|
| Age (yr) | 0.53 | ||
| <65 | 540 (50.6) | 426 (47.4) | |
| ⩾65–<74 | 295 (27.6) | 263 (29.3) | |
| ⩾75–<84 | 190 (17.8) | 175 (19.5) | |
| ⩾85 | 42 (3.9) | 35 (3.9) | |
| Sex, male | 709 (66.4) | 622 (69.2) | 0.20 |
| Race | 0.48 | ||
| Asian | 113 (10.6) | 79 (8.8) | |
| Black | 195 (18.3) | 166 (18.5) | |
| White | 368 (34.5) | 331 (36.8) | |
| Other/multiracial | 335 (31.4) | 285 (31.7) | |
| Unknown | 56 (5.3) | 38 (4.2) | |
| Insurance | 0.65 | ||
| Commercial | 337 (31.6) | 265 (29.5) | |
| Medicaid | 223 (20.9) | 211 (23.5) | |
| Medicare | 474 (44.4) | 393 (43.7) | |
| Other/self pay | 33 (3.1) | 30 (3.3) | |
| BMI | <0.001 | ||
| <30 | 533 (50.0) | 426 (47.4) | |
| ⩾30 (obesity) | 481 (45.1) | 368 (40.9) | |
| Missing data | 53 (5.0) | 105 (11.7) | |
| Past medical history | |||
| Hypertension | 680 (63.7) | 521 (58.0) | 0.009 |
| Diabetes | 452 (42.4) | 366 (40.7) | 0.46 |
| Chronic heart disease | 142 (13.3) | 110 (12.2) | 0.48 |
| Chronic lung disease | 44 (4.1) | 37 (4.1) | >0.99 |
| After-hours intubation (17:00–9:00) | 421 (39.5) | 373 (41.5) | 0.36 |
| Time from starting respiratory symptom until intubation (d)* | 0.22 | ||
| <5 | 206 (19.3) | 142 (15.8) | |
| ⩾5–<8 | 213 (20.0) | 170 (18.9) | |
| ⩾8–<14 | 295 (27.6) | 257 (28.6) | |
| ⩾14 | 238 (22.3) | 221 (24.6) | |
| Missing data | 115 (10.8) | 109 (12.1) | |
| SAPS II at ICU admission* | 0.01 | ||
| <50 | 225 (21.1) | 169 (18.8) | |
| ⩾50–<60 | 241 (22.6) | 208 (23.1) | |
| ⩾60–<70 | 238 (22.3) | 224 (24.9) | |
| ⩾70 | 250 (23.4) | 239 (26.6) | |
| Missing data | 113 (10.6) | 59 (6.6) |
Definition of abbreviations: BMI = body mass index; ICU = intensive care unit; SAPS II = Simplified Acute Physiology Score II.
*
We categorized these variables by quantile.