Table 2 Characteristics of included patients (N = 12,803)
Characteristic | Category | n (%) |
Age range (y) | < 1 | 2063 (16.1) |
1 to < 5 | 2586 (20.2) | |
5 to < 15 | 900 (7.0) | |
15 to < 50 | 2452 (19.2) | |
50 to < 65 | 1425 (11.1) | |
65 to < 75 | 1241 (9.7) | |
75 to < 85 | 1255 (9.8) | |
≥85 | 881 (6.9) | |
Sex | Female | 6269 (49.0) |
Male | 6534 (51.0) | |
Chronic conditions | 0 | 7506 (58.6) |
1 | 2499 (19.5) | |
> 1 | 2798 (21.9) | |
Pregnant a | Yes | 263 (2.1) |
Hospitalized in the last 12 months b | Yes | 3417 (29.2) |
Underlying chronic conditions | Cardiovascular disease | 3048 (23.8) |
COPD | 1592 (12.4) | |
Diabetes | 1490 (11.6) | |
Renal disease | 745 (5.8) | |
Neoplasms | 669 (5.2) | |
Asthma | 655 (5.1) | |
Neuromuscular disease | 487 (3.8) | |
Immunological disorders | 392 (3.1) | |
Autoimmune diseases | 230 (1.8) | |
Cirrhosis | 206 (1.6) | |
Rheumatological disease | 135 (1.1) | |
Obesity c | Yes | 1300 (20.0) |
Consultations with a general practitioner in the last 3 months | 0 | 4848 (43.8) |
1 | 2187 (19.7) | |
> 1 | 4043 (36.5) | |
Smoking habits d | Never smoker | 3583 (50.6) |
Past smoker | 1953 (27.6) | |
Current smoker | 1546 (21.8) | |
Functional status impairment (Barthel score) e | Total (0–15) | 172 (5.5) |
Severe (20–35) | 129 (4.1) | |
Moderate (40–55) | 222 (7.1) | |
Mild (60–90) | 831 (26.5) | |
Minimal (95–100) | 1786 (56.9) | |
Influenza vaccination ≥14 days from symptom onset | Yes | 1818 (14.2) |
Antiviral use during the current episode | Yes | 2544 (19.9) |