Table 3.
ED visit characteristics and missing data
| ED visit Variables | categories | N | (% ED visits) | % Valid |
|---|---|---|---|---|
| Mode of presentation | Spontaneous | 316,153 | (94.9) | 94.9 |
| Referred | 16,875 | (5.1) | 5.1 | |
| Valid | 333,028 | (100.0) | 100.0 | |
| Missing | 0 | |||
| Time of ED visit | Day shift (7 AM-7 PM) | 246,520 | (74.0) | 74.0 |
| Night shift (7 PM-7 AM) | 86,508 | (26.0) | 26.0 | |
| Valid | 333,028 | (100.0) | 100.0 | |
| Missing | 0 | |||
| Reason for attendance | Local symptoms | 106,831 | (32.1) | 32.8 |
| General symptoms | 150,423 | (45.2) | 46.2 | |
| External causes | 30,323 | (9.1) | 9.3 | |
| Evaluation | 37,780 | (11.3) | 11.6 | |
| Valid | 325,357 | (97.7) | 100.0 | |
| Missing (scheduled visits) | 7671 | (2.3) | ||
| ED outcome | Admission | 52,592 | (15.8) | 15.8 |
| Discharge | 280,436 | (84.2) | 84.2 | |
| Valid | 333,028 | (100.0) | 100.0 | |
| Missing | 0 | |||
| Admission Variables | ||||
| Type of hospitalization | Surgical | 26,091 | (7.8) | 50.5 |
| Clinical | 25,537 | (7.7) | 49.5 | |
| Valid | 51,628 | (15.5) | 100.0 | |
| Missing (other specialties) | 964 | (0.3) | ||
| Missing (discharged from ED) | 280,436 | (84.2) | ||
| Main Procedure | Clinical | 36,376 | (10.9) | 69.4 |
| Surgical | 14,564 | (4.4) | 27.8 | |
| Transplant-related | 1493 | (0.4) | 2.8 | |
| Valid | 52,433 | (15.7) | 100.0 | |
| Missing (diagnostic testing) | 146 | (0.0) | ||
| Missing (discharged from ED) | 280,449 | (84.2) | ||
| Use of ICU | No | 38,977 | (11.7) | 74.1 |
| Yes | 13,615 | (4.1) | 25.9 | |
| Valid | 52,592 | (15.8) | 100.0 | |
| Missing (discharged from ED) | 280,436 | (84.2) | ||
| Final admission outcome | Death | 6674 | (2.0) | 12.7 |
| Discharge | 45,918 | (13.8) | 87.3 | |
| Valid | 52,592 | (15.8) | 100.0 | |
| Missing (discharged from ED) | 280,436 | (84.2) | ||
| Categorized LOS | 0–1 | 11,252 | (3.4) | 21.4 |
| 2–2 | 6455 | (1.9) | 12.3 | |
| 3–3 | 4612 | (1.4) | 8.8 | |
| 4–7 | 11,158 | (3.4) | 21.2 | |
| 8–20 | 13,462 | (4.0) | 25.6 | |
| 21+ | 5640 | (1.7) | 10.7 | |
| Valid | 52,579 | (15.8) | 100.0 | |
| Missing (discharged from ED) | 280,449 | (84.2) | ||
Missing data: 7671 (2.3%) due to ‘scheduled attendances’, 964 (0.3%) due to admissions to other specialties and 146 (0.0%) due to diagnostic testing. Valid percentages are out of the total number of eligible ED visits, or total number of admissions, after exclusions and without missing data