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Table 2 Characteristics of included patients (N = 12,803)

From: Complicated hospitalization due to influenza: results from the Global Hospital Influenza Network for the 2017–2018 season

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)
  1. Abbreviation: COPD Chronic obstructive pulmonary disease
  2. a Proportion of females (N = 6269)
  3. bN = 11,690
  4. c Assessed for patients aged ≥18 years only, defined as a body mass index > 30 kg/m2, N = 6516
  5. d Assessed for patients aged ≥18 years only, N = 7082
  6. e Assessed for patients aged ≥65 years only, N = 3140