Table 2. Reasons for exclusion and their associated frequency in full text screening.

Reason for exclusion	Frequency
Demographic association not reported	32
Study addresses profession- or risk- specific subset of population	18
Results could not be converted into an effect size	16
Behavior studied in the context of seasonal rather than pandemic influenza	7
No behavioral response provided that is suitable for inclusion	7
Sample populations and measured behavioral response are same as another study	6
Uninterpretable or inconsistent results	6
Interview/focus group study	2
All results unreported due to nonsignificance	1
Duplicate record	1