Figure 18: Hospital separations for all diagnoses* ICD-10-AM coded as J09, J10 or J11, Australia, 2004-2009, by 5-year age group This figure presents the number of hospital separations for all diagnoses ICD-10-AM coded as J09, J10 or J11 between 2004 and 2009 by 5-year age group. This figure presents hospital separations as: (i) number of hospital separations; (ii) rate per 1,000 separations; (iii) rate per 100,000 population. This figure highlights that between 2004 and 2009, hospital separations remained highest for children aged less than 5 years. The age-specific hospitalisation incidence profile suggests that hospitalisation with influenza in 2009 were more common in younger to middle age groups, and less common in those aged over 70 years. Hospital separation rates associated with influenza, as a potential measure of impact, showed a relatively steady decrease with increasing age in 2009; rather than an initial pronounced decrease in the 5-14 years age groups, followed by a moderate increase and almost plateau in the middle years age groups seen in previous years.