Table 2. Influenza-positive and negative patients included in the study, by male sex, age distribution, temperature group, with clinical symptoms and by period, GROG study, France, 2009–2014 (n = 14,994).
All cases n = 14,994 |
Patients with laboratory-confirmed influenza n = 5,806 |
Patients who tested negative for influenza n = 9,188 |
||||
---|---|---|---|---|---|---|
n | % | n | % | n | % | |
Sex | ||||||
Male sex: n (%) | 7,674 | 51.2 | 3,004 | 51.7 | 4,670 | 50.8 |
Age distribution (years) | ||||||
0–4 | 5,521 | 36.8 | 163 | 28.2 | 3,886 | 42.3 |
5–14 | 3,582 | 23.9 | 1,897 | 32.7 | 1,685 | 18.3 |
15–64 | 5,338 | 35.6 | 2,074 | 35.7 | 3,264 | 35.5 |
≥ 65 | 553 | 3.7 | 200 | 3.4 | 353 | 3.8 |
Mean age (standard deviation) | 18.5 (± 20.6) | 19.1 (± 20.0) | 18.2 (± 21.0) | |||
Median age (interquartile range) | 9.0 (3.0–31.0) | 10.0 (4.0–31.0) | 7.0 (2.0–32.0) | |||
Temperature group (°C) | ||||||
T < 38 | 636 | 4.2 | 155 | 2.7 | 481 | 5.2 |
38 ≤ T < 38.5 | 1,868 | 12.5 | 553 | 9.5 | 1,315 | 14.3 |
38.5 ≤ T < 39 | 5,159 | 34.4 | 2,000 | 34.5 | 3,159 | 34.4 |
T ≥ 39 | 7,331 | 48.9 | 3,098 | 53.3 | 4,233 | 46.1 |
Clinical symptoms | ||||||
Cough | 12,476 | 83.2 | 5,224 | 90.0 | 7,252 | 78.9 |
Headache | 8,389 | 55.9 | 3,683 | 63.4 | 4,706 | 51.2 |
Weakness | 11,424 | 76.2 | 4,754 | 81.9 | 6,670 | 72.6 |
Chills | 8,735 | 58.3 | 3,766 | 64.9 | 4,969 | 54.1 |
Myalgia | 8,512 | 56.8 | 3,643 | 62.8 | 4,869 | 53.0 |
Coryza/rhinitis | 11,064 | 73.8 | 4,360 | 75.1 | 6,704 | 73.0 |
Conjunctivitis | 1,320 | 8.8 | 522 | 9.0 | 798 | 8.7 |
Gastrointestinal symptoms | 2,949 | 19.7 | 1,166 | 20.1 | 1,783 | 19.4 |
Adenopathy | 1,625 | 10.8 | 596 | 10.3 | 1,029 | 11.2 |
Pharyngitis | 8,424 | 56.2 | 3,109 | 53.6 | 5,315 | 57.9 |
Shortness of breath | 1,319 | 8.8 | 428 | 7.4 | 891 | 9.7 |
Otitis/otalgia | 1,544 | 10.3 | 469 | 8.1 | 1,075 | 11.7 |
Bronchitis | 1,324 | 8.8 | 399 | 6.9 | 925 | 10.1 |
Rash | 98 | 0.7 | 22 | 0.4 | 76 | 0.8 |
Period | ||||||
RSV bronchiolitis period | 6,444 | 43.0 | 2,228 | 38.4 | 4,216 | 45.9 |
Pandemic period | 4,282 | 28.6 | 1,534 | 26.4 | 2,748 | 29.9 |
Seasonal period | 6,470 | 43.2 | 2,939 | 50.6 | 3,531 | 38.4 |
GROG: Groupes Régionaux d’Observation de la Grippe; RSV: respiratory syncytial virus; T: temperature.