Table 4.

Incidence estimates of laboratory-confirmed influenza ICU admission among infants under 6 months of age

First author (year)	Time period	Number of cases	Denominator	Rate per 10 000 (95% CI)	Adjustment
Ampofo (2006)26	July 2001 to June 2004	Nine*	25 710	3.5 per 10 000 population (1.7 to 6.4)*	None
Iwane (20004)32	2000–2001	0	8591	0	None
Ji (2010)39	January 2007 to December 2008	3	48 147*	0.62 per 10 000 person-years (1.6 to 17.0)*	None
Libster (2010)40	May 2009 to July 2009	12	41 000	2.9 per 10 000 population (1.6 to 5.0)*	None
Poehling (2006)9	2000–2001 to 2003–2004	2	40 000	0.5 per 10 000 population (0.8 to 16.5)*	None
Silvennoinen (2011)45	July 1988 to June 2004	5	31 884	1.6 per 10 000 population 0.6 to 3.5)*	None
Stein (2010)46	12 July 2009 to 24 December 2009	4	16 000*	2.5 per 10 000 population†	None

*Estimated by review authors from information reported in original study.

†Estimated from figure 2 in original study.⁴⁶