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Table 2 Distribution of severity indicators by flu season. Values given in per cent, with number of illness episodes in parentheses

From: Disease severity determines health-seeking behaviour amongst individuals with influenza-like illness in an internet-based cohort

  Percentage of individuals per category in each year (No.)
2011–12 2012–13 2013–14 2014–15 Combined
Symptoms
 ARI 45 (586/1302) 32.3 (951/2947) 41.2 (1049/2544) 33.1 (887/2677) 36.7 (3473/9470)
 ILI–No fever 33.2 (432/1302) 31.4 (925/2947) 36.4 (926/2544) 32.2 (863/2677) 33.2 (3146/9470)
 ILI-Fever 13.4 (175/1302) 21.1 (623/2947) 13.8 (352/2544) 21.1 (564/2677) 18.1 (1714/9470)
 ILI-Fever, with phlegm 8.4 (109/1302) 15.2 (448/2947) 8.5 (217/2544) 13.6 (363/2677) 12 (1137/9470)
Duration (days)
 0–3 56.2 (732/1302) 50.9 (1501/2947) 56.9 (1443/2537) 51 (1364/2676) 53.3 (5040/9462)
 4–7 26.8 (349/1302) 28.3 (834/2947) 24.5 (622/2537) 28.1 (752/2676) 27 (2557/9462)
 8–14 11.8 (154/1302) 13 (384/2947) 12.7 (322/2537) 12.8 (343/2676) 12.7 (1203/9462)
  ≥ 15 5.2 (67/1302) 7.7 (228/2947) 5.9 (150/2537) 8.1 (217/2676) 7 (662/9462)
Health-score decrease
 0–10% - 21.5 (463/2153) 26.3 (573/2181) 22 (536/2440) 23.2 (1572/6774)
 10.1-% - 21.7 (468/2153) 24.5 (535/2181) 25.3 (618/2440) 23.9 (1621/6774)
 20.1–30% - 16.1 (347/2153) 17.8 (388/2181) 15.7 (382/2440) 16.5 (1117/6774)
 30.1–50% - 22.4 (483/2153) 21.2 (463/2181) 21.6 (527/2440) 21.7 (1473/6774)
  ≥ 50.1% - 18.2 (392/2153) 10.2 (222/2181) 15.5 (377/2440) 14.6 (991/6774)