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Table 2 Characteristics of all participants, and participants with at least two reports included in the study

From: Incidence and risk factors for influenza-like-illness in the UK: online surveillance using Flusurvey

All registered participants Participants with 2 or more symptoms surveys
Age group Participants Participants (% of all participants) Percent of Flusurvey sample Percent of UK population Female n (%) Risk factor n (%) Vaccine n (%)
0-17 403 274 (68.0) 6.2 21.0 136 (49.6) 30 (10.9) 24 (8.8)
18-24 382 202 (52.9) 4.6 9.4 142 (70.3) 30 (14.9) 25 (12.4)
25-34 1132 774 (68.4) 17.5 13.6 557 (72.0) 100 (12.9) 153 (19.8)
35-44 1281 903 (70.5) 20.4 13.5 611 (67.7) 138 (15.3) 204 ( 22.6)
45-64 2138 1778 (83.2) 40.1 25.4 1150 (64.7) 326 (18.3) 583 (32.8)
65+ 607 501 (82.5) 11.3 17.1 288 (57.5) 183 (36.5) 450 (89.8)
% of total included in our study     75.9% 79.1% 84.4%
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