Table 2. Overall and Age-Specific ICU Admission Rate per 100,000 symptomatic cases and per 100,000 infections (Week 35 of 2009 to Week 6 of 2010).

Age group	Cumulative numberof symptomatic cases/infectionsa	Number of 2009 pandemic influenza A(H1N1) cases admitted to ICUs	ICU admission rate(95% CI)(per 100,000 symptomatic cases)	ICU admission rate(95% CI)(per 100,000 infections)
0–4 years	65,544/182,067	5	7.6	2.8
			(2.5–17.8)	(0.8–6.4)
5–19 years	432,395/1,201,096	27	6.2	2.3
			(4.1–9.1)	(1.5–3.3)
20–29 years	103,280/286,890	30	29.1	10.5
			(19.6–41.5)	(7.1–14.9)
30–49 years	104,403/290,009	110	105.4	37.9
			(86.6–127.0)	(31.2–45.7)
50–64 years	53,574/148,817	74	138.1	49.7
			(108.5–173.4)	(39.1–62.4)
65+ years	11,835/32,876	41	346.4	124.7
			(248.7–469.7)	(89.5–169.1)
Greek population	771,031/2,141,754	287	37.2	13.4
			(33.0–41.8)	(11.9–15.0)

^aCases up to week 5/2010 – ICU admissions up to week 6/2010. Symptomatic cases were obtained based on ILI-38 definition (ILI-38: fever >38°C and cough or sore throat).