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Table 2 Characteristics of included patients overall and by site

From: Influenza epidemiology and influenza vaccine effectiveness during the 2014–2015 season: annual report from the Global Influenza Hospital Surveillance Network

  St. Petersburg Moscow Czech Republic Turkey Beijing Valencia Total
  N = 2715 N = 1400 N = 79 N = 614 N = 1149 N = 3657 N = 9614
Characteristic n % n % n % n % n % n % n %
Age in years, median (range) 3 (0–94) 19 (0–90) 51 (19–91) 12 (0–98) 8 (0–96) 73 (0–106) 21 (0–106)
Age group
 0–1 y 714 26.3 137 9.8 0 0.0 112 18.2 76 6.6 476 13.0 1515 15.8
 2–4 y 1034 38.1 371 26.5 0 0.0 133 21.7 403 35.1 265 7.2 2206 22.9
 5–17 y 357 13.1 171 12.2 0 0.0 80 13.0 147 12.8 72 2.0 827 8.6
 18–49 y 426 15.7 632 45.1 38 48.1 38 6.2 106 9.2 221 6.0 1461 15.2
 50–64 y 110 4.1 59 4.2 14 17.7 75 12.2 131 11.4 359 9.8 748 7.8
 65–74 y 39 1.4 13 0.9 12 15.2 69 11.2 93 8.1 593 16.2 819 8.5
 75–84 y 31 1.1 11 0.8 9 11.4 80 13.0 127 11.1 969 26.5 1227 12.8
 ≥85 y 4 0.1 6 0.4 6 7.6 27 4.4 66 5.7 702 19.2 811 8.4
Sex
 Male 1489 54.8 827 59.1 40 50.6 356 58.0 696 60.6 2009 54.9 5417 56.3
 Female 1226 45.2 573 40.9 39 49.4 258 42.0 453 39.4 1648 45.1 4197 43.7
Chronic conditions
 0 2380 87.7 1246 89.0 29 36.7 182 29.6 820 71.4 1210 33.1 5867 61.0
 1 244 9.0 116 8.3 31 39.2 196 31.9 233 20.3 1026 28.1 1846 19.2
 >1 91 3.4 38 2.7 19 24.1 236 38.4 96 8.4 1421 38.9 1901 19.8
Previously hospitalised (last 12 months)
 No 1781 65.6 1123 80.2 56 70.9 341 55.5 964 85.1 2491 68.1 6756 70.4
 Yes 934 34.4 277 19.8 23 29.1 273 44.5 169 14.9 1166 31.9 2842 29.6
Underlying chronic conditions
 Cardiovascular disease 140 5.2 68 4.9 29 36.7 215 35.0 218 19.0 1328 36.3 1998 20.8
 Chronic obstructive pulmonary disease 51 1.9 19 1.4 6 7.6 153 24.9 137 11.9 1093 29.9 1459 15.2
 Asthma 60 2.2 19 1.4 3 3.8 74 12.1 8 0.7 282 7.7 446 4.6
 Immunodeficiency/organ transplant 30 1.1 0 0.0 3 3.8 48 7.8 0 0.0 25 0.7 106 1.1
 Diabetes 32 1.2 14 1.0 12 15.2 96 15.6 34 3.0 860 23.5 1048 10.9
 Renal impairment 18 0.7 26 1.9 4 5.1 61 9.9 12 1.0 485 13.3 606 6.3
 Neuromuscular disease 68 2.5 15 1.1 1 1.3 79 12.9 12 1.0 92 2.5 267 2.8
 Neoplasm 7 0.3 9 0.6 9 11.4 79 12.9 7 0.6 190 5.2 301 3.1
 Cirrhosis/liver disease 34 1.3 21 1.5 5 6.3 19 3.1 5 0.4 118 3.2 202 2.1
Autoimmune disease 13 0.5 14 1.0 4 5.1 22 3.6 0 0.0 122 3.3 175 1.8
Pregnant (women 15–45 y) 0 0.0 291 95.7 1 7.1 1 4.8 0 0.0 5 5.7 298 45.4
Obese (all ages) 263 9.7 162 11.6 12 15.2 109 17.8 155 13.5 957 26.2 1658 17.2
Outpatient consultations last 3 months
 0 1215 44.8 492 35.1 23 29.1 113 18.4 4 0.3 649 17.7 2496 26.0
 1 895 33.0 314 22.4 19 24.1 100 16.3 697 60.9 678 18.5 2703 28.1
 >1 605 22.3 594 42.4 37 46.8 401 65.3 443 38.7 2330 63.7 4410 45.9
Smoking habits (patients ≥18 y)
 Never smoker 325 53.3 345 47.9 40 50.6 135 46.7 269 51.4 1363 47.9 2477 48.9
 Past smoker 76 12.5 136 18.9 19 24.1 117 40.5 162 31 1034 36.4 1544 30.5
 Current smoker 209 34.3 240 33.3 20 25.3 37 12.8 92 17.6 447 15.7 1045 20.6
Functional status impairment (Barthel score; patients ≥65 y)
 Total (0–15) 1 1.4 0 0.0 3 11.1 6 3.4 23 10.0 166 7.3 199 7.1
 Severe (20–35) 1 1.4 0 0.0 1 3.7 3 1.7 19 8.3 71 3.1 95 3.4
 Moderate (40–55) 1 1.4 1 3.3 1 3.7 6 3.4 37 16.1 140 6.2 186 6.6
 Mild (60–90) 25 33.8 6 20.0 9 33.3 76 43.2 136 59.1 414 18.3 666 23.8
 Minimal (95–100) 46 62.2 23 76.7 13 48.1 85 48.3 15 6.5 1473 65.1 1655 59.1
Sampling time
 0–2 days 1351 49.8 655 46.8 20 25.3 125 20.4 324 28.2 896 24.5 3371 35.1
 3–4 days 915 33.7 523 37.4 26 32.9 213 34.7 382 33.2 1572 43.0 3631 37.8
 5–7 days 449 16.5 221 15.8 24 30.4 239 38.9 358 31.2 1058 28.9 2349 24.4
 8–9 days 0 0.0 1 0.1 9 11.4 37 6.0 85 7.4 131 3.6 263 2.7
Influenza vaccination ≥14 days from symptom onset 59 2.2 39 2.8 1 1.3 28 4.6 127 11.1 1759 48.1 2013 20.9