Table 6.
Variables with the greatest importance selected by GBM
| Variable Frequencies, No.(%) | ||||
|---|---|---|---|---|
| Categorical variables | Negative Delirium Screening n = 20294 |
Positive Delirium Screening n = 8057 |
Selection by RF |
Selection by LR |
| Dementia | 814 (4.0) | 2466 (30.6) | ✓ | ✓ |
| Nervous system signs and symptoms | 3928 (19.4) | 4040 (50.1) | ✓ | ✓ |
| Dysphagia | 1567 (7.7) | 1953 (24.2) | ✓ | ✓ |
| Previous encounter: dementia | 741 (3.70) | 1294 (16.1) | ✓ | ✓ |
| Urinary tract infections | 1818 (9.0) | 1585 (19.7) | ✓ | ✓ |
| Fluid and electrolyte disorders | 6192 (30.5) | 3291 (40.8) | ✓ | |
| Epilepsy; convulsions | 771 (3.8) | 793 (9.8) | ✓ | ✓ |
| Traumatic brain injury (TBI); concussion, initial encounter | 1554 (7.7) | 1177 (14.6) | ✓ | ✓ |
| Previous encounter: Other nervous system disorders (neither hereditary nor degenerative) | 1961 (9.7) | 1323 (16.4) | ✓ | ✓ |
| Symptoms of mental and substance use conditions | 128 (0.6) | 302 (3.7) | ✓ | ✓ |
| Neurocognitive disorders | 147 (0.7) | 367 (4.6) | ✓ | ✓ |
| Acute hemorrhagic cerebrovascular disease | 1616 (8.0) | 1271 (15.8) | ✓ | |
| overweight (BMI > 24.9) | 14286 (70.4) | 4895 (60.8) | ✓ | |
| Other nervous system disorders (neither hereditary nor degenerative) | 1418 (7.0) | 1095 (13.6) | ✓ | |
| Previous encounter: Nervous system signs and symptoms | 4045 (19.9) | 2228 (27.7) | ✓ | ✓ |
| Malnutrition | 2174 (10.7) | 1412 (17.5) | ✓ | ✓ |
| Cerebral infarction | 2092 (10.3) | 1418 (17.6) | ✓ | |
| Respiratory failure; insufficiency; arrest | 2871 (14.1) | 1476 (18.3) | ✓ | |
| Previous encounter: Neurocognitive disorders | 436 (2.1) | 534 (6.6) | ✓ | |
| Blood nitrogen urea below normal range | 7464 (36.8) | 3497 (43.4) | ✓ | |
| Previous encounter: Essential hypertension | 9543 (47.0) | 3043 (37.8) | ||
| Nonspecific chest pain | 3213 (15.8) | 695 (8.6) | ✓ | |
| Gender | 10607 (52.3) | 3823 (47.4) | ✓ | |
| Benzodiazepine | 1730 (8.5) | 1066 (13.2) | ✓ | |
| Cardiac dysrhythmias | 5788 (28.5) | 2789 (34.6) | ✓ | |
| Previous encounter: Disorders of lipid metabolism | 7245 (35.7) | 2095 (26.0) | ✓ | |
| Previous encounter: Abdominal pain and other digestive/abdomen signs and symptoms | 5168 (25.5) | 1333 (16.5) | ✓ | |
| Previous encounter: Respiratory signs and symptoms | 9535 (49.4) | 3504 (47.4) | ✓ | |
| Continuous Variables | Mean (SD) | |||
| Age | 75.2 (7.6) | 79.1 (8.6) | ✓ | ✓ |
| Heart rate, beats/min | 77.6 (15.5) | 80.1 (16.9) | ✓ | |