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.