Table 1.

Primary and secondary outcome measures collected at different time points

Outcome measure	Measurement time points and methods
Primary outcome
Proportion of participants obtaining influenza vaccination during the study	Study completion* (via self-reports and clinical audit)
Secondary outcome
Proportion of participants visiting the UHS during the study	Study completion* (via self-reports and clinical audit)
Ancillary outcomes
Proportion of participants experiencing symptoms of ILI† during the study	Monthly from study commencement in May to October 2010 (via self-reports)
Proportion of participants using medications or remedies due to ILI symptoms†	Monthly from study commencement in May to October 2010 (via self-reports)
Proportion of participants visiting a healthcare professional due to ILI symptoms†	Monthly from study commencement in May to October 2010 (via self-reports)
Proportion of participants experiencing impairment in work or study due to ILI symptoms†	Monthly from study commencement in May to October 2010 (via self-reports)
Number of days absent from work or study due to ILI symptoms (per participant)	Monthly from study commencement in May to October 2010 (via self-reports)
Reasons for receiving (or not receiving) influenza vaccine	Study completion* (via self-reports)
Patterns of usage and feedback concerning PCHMS	Study completion* (via automatic system logs, data entered by participants into the PCHMS, and self-reports)

^*Estimated end of average respiratory disease and influenza season in the southern hemisphere (ie, October 2010, 6 months from study commencement).

^†Defined by case definitions of influenza (fever with cough or a sore throat) issued by NSW Health and Centers for Disease Control and Prevention (CDC) as of March 26, 2010.

ILI, influenza-like illness; PCHMS, personally controlled health management system; UHS, University Health Service.