Research Article
The Anion Gap and Mortality in Critically Ill Patients with Hip Fractures
Table 2
Baseline characteristics of the study population according to AG.
| | | AG | P value | | <12.5 | ≧12.5 |
| | N | 225 | 170 | |
| | Age, years | 69.5 ± 21.3 | 75.1 ± 16.0 | 0.026 |
| | Sex, n (%) | | | 0.459 | | Male | 117 (52.0%) | 82 (48.2%) | | | Female | 108 (48.0%) | 88 (51.8%) | |
| | Ethnicity, n (%) | | | 0.088 | | White | 189 (84.0%) | 128 (75.3%) | | | Black | 7 (3.1%) | 10 (5.9%) | | | Others | 29 (12.9%) | 32 (18.8%) | |
| | Vital signs | | | | | SBP (mmHg) | 118.2 ± 16.8 | 117.9 ± 16.1 | 0.874 | | DBP (mmHg) | 57.3 ± 10.4 | 57.6 ± 11.9 | 0.723 | | MAP (mmHg) | 75.1 ± 11.2 | 74.9 ± 11.1 | 0.773 | | Heart rate (bpm) | 89.5 ± 16.0 | 86.9 ± 16.0 | 0.129 | | Respiratory rate (t/min) | 18.7 ± 3.9 | 19.2 ± 3.8 | 0.403 | | Temperature (°C) | 36.9 ± 0.6 | 36.7 ± 0.7 | 0.013 | | SpO2 (%) | 97.5 ± 2.0 | 96.4 ± 4.8 | <0.001 |
| | Comorbidities | | | | | Heart failure, n (%) | 66 (29.3%) | 64 (37.6%) | 0.082 | | Hypertension, n (%) | 22 (9.8%) | 38 (22.4%) | <0.001 | | Obesity, n (%) | 9 (4.0%) | 9 (5.3%) | 0.541 | | Infection, n (%) | 104 (46.2%) | 83 (48.8%) | 0.608 |
| | Laboratory parameters | | | | | WBC, 109/L | 9.6 ± 4.5 | 11.4 ± 7.4 | 0.010 | | Platelet, 109/L | 178.5 ± 90.5 | 200.7 ± 119.7 | 0.069 | | Hemoglobin (g/dl) | 9.1 ± 1.6 | 9.6 ± 2.0 | <0.001 | | Hematocrit (%) | 26.4 ± 5.0 | 28.4 ± 6.0 | <0.001 | | Creatinine (mg/dl) | 0.9 ± 0.4 | 1.6 ± 1.5 | <0.001 | | BUN (mg/dl) | 20.0 ± 11.7 | 30.3 ± 19.2 | <0.001 | | Lactate (mol/L) | 1.7 ± 0.8 | 2.1 ± 1.5 | 0.021 |
| | Scoring systems | | | | | APSIII score | 44.7 ± 17.2 | 52.3 ± 21.1 | <0.001 | | Length of stay in ICU | 4.0 ± 5.2 | 4.1 ± 4.3 | 0.626 | | 30-day mortality | 28 (12.4%) | 36 (21.2%) | 0.020 | | 90-day mortality | 42 (18.7%) | 48 (28.2%) | 0.025 |
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AG, anion gap; SBP, systolic blood pressure; DBP, diastolic blood pressure; MAP, mean arterial pressure; ICU, intensive care unit; WBC, white blood cell; BUN, blood urea nitrogen.
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