Table 2. Comparisons of numbers of influenza A(H1N1) 2009 cases with severe complications and deaths between 2009–10 and 2010–11 seasons (as of March 31, 2011)^*.

Characteristic	2009–10 season	2010–11 season	p value
	n (%)	n (%)
Severe complications			<0.0001
0–4 years	119 (12.7)	81 (7.8)
5–19 years	370 (39.4)	87 (8.4)
20–49 years	277 (29.5)	411 (39.5)
50–64 years	105 (11.2)	305 (29.3)
≥65 years	68 (7.2)	156 (15.0)
Deaths			<0.0001
0–4 years	1 (2.3)	3 (3.2)
5–19 years	8 (18.2)	2 (2.2)
20–49 years	22 (50.0)	24 (25.8)
50–64 years	9 (20.5)	49 (52.7)
≥65 years	4 (9.1)	15 (16.1)

^*2009–10 season: from week 26, 2009 to week 25, 2010; 2010–11 season: from week 26, 2010 to week 13, 2011.