Table 1. Characteristics of included admissions.
| n (%) | |
|---|---|
| Total | 21744 (100) |
| Sex | |
| Male | 8771 (40.34) |
| Female | 12973 (59.66) |
| Age (years) | |
| 18–35 (n,%) | 4880 (22.44) |
| 36–54 (n,%) | 4385 (20.17) |
| 55–64 (n,%) | 2685 (12.35) |
| 65–74 (n,%) | 3274 (15.06) |
| ≥75 (n,%) | 6520 (29.99) |
| Average (±SD) | 58 (22) |
| Admission type | |
| Non-urgent | 3968 (18.25) |
| Urgent | 17776 (81.75) |
| Groups of illnesses/conditions | |
| Diseases of the digestive system | 2468 (11.35) |
| Diseases of the respiratory system | 2280 (10.49) |
| Injury and poisoning | 2110 (9.7) |
| Neoplasms | 1943 (8.94) |
| Diseases of the genitourinary system | 1783 (8.2) |
| Mental Illness | 885 (4.07) |
| Endocrine nutritional and metabolic diseases and immunity disorders | 471 (2.17) |
| Illnesses/Conditions | |
| Urinary tract infections | 605 (2.78) |
| Congestive heart failure; nonhypertensive | 434 (2) |
| Hypertension with complications and secondary hypertension | 329 (1.51) |
| Other complications of pregnancy | 291 (1.34) |
| Early or threatened labour | 232 (1.07) |
| Mood disorders | 232 (1.07) |
| Chronic obstructive pulmonary disease and bronchiectasis | 214 (0.98) |
| Diabetes mellitus with complications | 182 (0.84) |
| Fluid and electrolyte disorders | 176 (0.81) |
| Other lower respiratory disease | 152 (0.7) |
| Secondary malignancies | 144 (0.66) |
| Cancer of rectum and anus | 105 (0.48) |
| Number of comorbidities | |
| 0 | 3256 (14.97) |
| 1 | 4513 (20.76) |
| 2 | 3027 (13.92) |
| 3 | 2493 (11.47) |
| 4 | 2075 (9.54) |
| 5 | 1549 (7.12) |
| 6 | 1258 (5.79) |
| 7 | 1024 (4.71) |
| 8 | 725 (3.33) |
| 9 | 571 (2.63) |
| 10 | 385 (1.77) |
| 11 | 265 (1.22) |
| 12 | 197 (0.91) |
| 13 | 148 (0.68) |
| 14 or over | 258 (1.19) |
| Treatment type | |
| Surgical | 7006 (32.22) |
| Medical | 14738 (67.78) |
| Length of stay (days) | |
| 0–3 | 7168 (32.97) |
| 4–6 | 4435 (20.4) |
| 7–11 | 4428 (20.36) |
| ≥12 | 5713 (26.27) |
| Average (±SD) | 10 (14) |
| Median (IQR) | 6 (3–12) |
Notes: IQR–interquartile range; SD–standard deviation.
For groups of illnesses/conditions, due to the high number of categories, the table includes only those responsible for 90% of ED returns and that were significantly associated with ED returns. Similarly for illnesses/ conditions, but the percentage was 50%. Results for all categories are included in supporting information.