TABLE 1.
Characteristics of the study cohort according to laboratory-confirmed and clinically diagnosed influenza cases
| Laboratory-confirmed influenza (n=200) | Clinical diagnosis of influenza (n=391) | |||
|---|---|---|---|---|
|
|
|
|||
| Yes (n=47) | No (n=153) | Yes (n=54) | No (n=337) | |
| Admitting service | ||||
| Internal medicine | 30 (63.8) | 103 (67.3) | 37 (68.5) | 207 (61.4) |
| Respirology | ≤5 (10.6) | 7 (4.6) | ≤5 (5.6) | 32 (9.5) |
| Family medicine | ≤5 (4.3) | 13 (8.5) | ≤5 (3.7) | 21 (6.2) |
| Oncology | ≤5 (4.3) | ≤5 (3.3) | ≤5 (3.7) | 14 (4.2) |
| Critical care | ≤5 (4.3) | 7 (4.6) | ≤5 (3.7) | 11 (3.3) |
| Hematology | ≤5 (6.4) | ≤5 (3.3) | ≤5 (5.6) | 10 (3.0) |
| Nephrology | ≤5 (2.1) | ≤5 (1.3) | ≤5 (1.9) | 6 (1.8) |
| Obstetrics and gynecology | ≤5 (4.3) | ≤5 (1.3) | ≤5 (5.6) | ≤5 (0.9) |
| Other | n/a | 9 (5.8) | ≤5 (1.7) | 33 (9.7) |
| Sex | ||||
| Female | 24 (51.1) | 84 (54.9) | 30 (55.6) | 180 (53.4) |
| Male | 23 (48.9) | 69 (45.1) | 24 (44.4) | 157 (46.6) |
| Charlson Index score | ||||
| 0 | 23 (48.9) | 49 (32.0) | 28 (51.9) | 86 (25.5) |
| 1–2 | 18 (38.3) | 55 (35.9) | 16 (29.6) | 128 (38.0) |
| 3–4 | ≤5 (6.4) | 28 (18.3) | ≤5 (9.3) | 65 (19.3) |
| ≥5 | ≤5 (6.4) | 21 (13.7) | ≤5 (9.3) | 58 (17.2) |
| Admission month | ||||
| October | 6 (12.8) | 20 (13.1) | 6 (11.1) | 49 (14.5) |
| November | 41 (87.2) | 96 (62.7) | 47 (87.0) | 183 (54.3) |
| December | 0 (0.0) | 37 (24.2) | ≤5 (1.9) | 105 (31.2) |
| Age, years, mean ± SD | 49.13±17.36 | 66.87±18.31 | 49.19±18.69 | 67.93±18.46 |
| Length of stay, days, mean ± SD | 7.94±9.64 | 10.74±13.02 | 7.91±9.62 | 9.74±11.45 |
| Intensive care unit admission | 11 (23.4) | 35 (22.9) | 11 (20.4) | 55 (16.3) |
| Risk-adjusted mortality, mean ± SD | 0.05±0.07 | 0.15±0.13 | 0.06±0.07 | 0.14±0.13 |
Data presented as n (%) unless otherwise indicated. n/a Not applicable