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. 2017 Dec 13;1(4):bjgpopen17X101253. doi: 10.3399/bjgpopen17X101253

Table 3. Characteristics of ILI episodes reported by participants included in the study.

2012–2013, n (%) 2013–2014, n (%) 2014–2015, n (%) Total, n (%)
N 2184 1772 2067 6023
Symptoms (MD = 0)
 Fever 1162 (53.2) 820 (46.3) 1057 (51.1) 3039 (50.5)
 Chills 950 (43.5) 696 (39.3) 898 (43.4) 2544 (42.2)
 Coryza 1578 (72.3) 1309 (73.9) 1538 (74.4) 4425 (73.5)
 Sneezing 1206 (55.2) 970 (54.7) 1120 (54.2) 3296 (54.7)
 Sore throat 1516 (69.4) 1287 (72.6) 1377 (66.6) 4180 (69.4)
 Cough 1606 (73.5) 1256 (70.9) 1549 (74.9) 4411 (73.2)
 Dyspnoea 440 (20.1) 355 (20.0) 476 (23.0) 1271 (21.1)
 Headaches 1427 (65.3) 1151 (65.0) 1362 (65.9) 3940 (65.4)
 Pain 898 (41.1) 637 (35.9) 771 (37.3) 2306 (38.2)
 Sputum 436 (20.0) 346 (19.5) 366 (17.7) 1148 (19.1)
 Asthenia 1086 (49.7) 809 (45.7) 1008 (48.8) 2903 (48.2)
Sudden onset of symptoms (MD = 84)
 Yes 2018 (93.7) 1649 (94.3) 1915 (94.1) 5582 (94.0)
 No 136 (6.3) 100 (5.7) 121 (5.9) 357 (6.0)
Mean health score (± SD) (MD = 94) 42.8 (± 21.4)
Activities modification (MD = 50)
 No 1056 (48.7) 937 (53.4) 975 (47.6) 2968 (49.7)
 Yes, without taking time off work/school 662 (30.5) 513 (29.2) 631 (30.8) 1806 (30.2)
 Yes, with taking time off work/school 450 (20.8) 306 (17.4) 443 (21.6) 1199 (20.1)

ILI = influenza-like illness. MD = missing data. SD = standard deviation.