Table 1.

Exclusion criteria for title and abstract and full text review

Title and abstract exclusion criteria (not ranked)	Full text exclusion criteria (ranked)
Only presented data on non-human infections of influenza	Only presented data on non-human infections of influenza
Only presented data on human infections of avian, swine, or novel influenza	Article focused on a particular patient or case study
Article focused on a particular case study	For non-modelling papers, no influenza testing performed
For non-modelling articles, no influenza testing performed	No data on hospitalized patients presented
No data on hospitalized patients presented	No methods for estimating catchment population specified for hospital
No methods for estimating catchment population specified for hospital	No estimates of influenza-associated hospitalization rates presented
If laboratory testing for influenza performed, no confirmation using reverse transcription polymerase chain reaction (RT-PCR)	If laboratory testing for influenza performed, no confirmation using RT-PCR
Less than 12 months of data (or one full influenza season) presented	Less than 12 months of data (or one full influenza season) presented
Estimates or data only available during 2009 pandemic period for influenza A(H1N1)pdm09	Estimates or data only available during 2009 pandemic period for influenza A(H1N1)pdm09
Estimates only presented for special populations or risk groups (eg, pregnant women, health care workers)	Estimates only presented for special populations or risk groups (eg, pregnant women, health care workers)
Only mortality estimates presented	Only mortality estimates presented