Table 1 Demographic and clinical characteristics of study population
Variable | Positive test results (n = 2759) | All patients (n = 16,439) |
|---|---|---|
Female, n (%) | 1414 (51.3) | 7962 (48.4) |
Age (years), median (IQR) | 76 (57–85) | 66 (18–81) |
Season, n (%) | Â | Â |
 Influenzaa | 2352 (85.3) | 9016 (54.9) |
 Non-influenza | 407 (14.7) | 7423 (45.1) |
Year of admission, n (%) | Â | Â |
 2016 | 875 (31.7) | 6487 (39.5) |
 2017 | 1884 (68.3) | 9952 (60.5) |
Setting where the test was ordered | Â | Â |
 ED | 1668 (60.5) | 7750 (47.2) |
 Inpatient | 994 (36.0) | 8159 (49.6) |
 ED and inpatient | 97 (3.5) | 530 (3.2) |
Source of referral, n (%) | Â | Â |
 Emergency department | 2511 (91.0) | 13,890 (84.5) |
 Otherb | 248 (9.0) | 2549 (15.5) |
Mode of separation, n (%) | Â | Â |
 Discharged by hospital | 2215 (80.3) | 13,454 (81.9) |
 Transferred to another setting | 408 (14.8) | 2119 (12.9) |
 Died in the hospital | 100 (3.6) | 596 (3.6) |
 Other (e.g. left at own risk) | 36 (1.3) | 270 (1.6) |
Hospital, n (%) | Â | Â |
 A | 796 (28.9) | 4145 (25.2) |
 B | 566 (20.5) | 2731 (16.6) |
 C | 383 (13.9) | 2051 (12.5) |
 D | 493 (17.8) | 2978 (18.1) |
 E | 224 (8.1) | 959 (5.8) |
 F | 126 (4.6) | 710 (4.3) |
 G | 171 (6.2) | 2865 (17.4) |
Hospital length of stay (days), median (IQR) | 4.7 (2.4–10.1) | 5.1 (2.7–10.7) |
Charlson comorbidity index, median (IQR) | 1 (0–2) | 1 (0–2) |
ICD-10-AM principal diagnosis of influenza, n (%) | 1281 (46.4) | 1337 (8.1) |