Table 1.

Baseline clinical characteristics and peak body temperature of patients 15 years or younger and over 15 years

	2009–2010	2010–2011			P value between
	A(H1N1) pdm09 (a)	A(H1N1) pdm09 (b)	A(H3N2) (c)	B (d)	(a) and (b)	(b) and (c)	(c) and (d)	(b) and (d)
Number of patients	365	199	96	93
Age, mean years ± SD (range)	19·0 ± 13·6 (1–78)	25·7 ± 18·4 (1–81)	19·2 ± 19·5 (1–74)	14·9 ± 11·9 (3–66)	<0·001	<0·01	NS	<0·001
Male/female	188/177	105/94	58/38	39/54	NS	NS	<0·05	NS
Vaccination*	74/286/5	45/151/3	31/58/7	27/60/6	NS	NS	NS	NS
Positive/negative/unknown
Time from the onset	16·3 ± 11·3	15·4 ± 10·8	15·3 ± 10·8	16·5 ± 11·2	NS	NS	NS	NS
To the first visit at clinic (hours)
Peak body temperature (°C)	39·0 ± 0·7	39·0 ± 0·7	38·9 ± 0·7	38·9 ± 0·5	NS	NS	NS	NS
≤15 years (n)	39·1 ± 0·7 (200)	39·3 ± 0·6 (74)	39·0 ± 0·7 (66)	38·9 ± 0·5 (66)	<0·05	<0·01	NS	<0·001
>15 years (n)	38·8 ± 0·6 (165)	38·9 ± 0·7 (125)	38·7 ± 0·7 (30)	38·9 ± 0·5 (27)	NS	NS	NS	NS

*Vaccination for seasonal influenza.

() number of patients.