Table 2

Primary and secondary outcome measures collected at different time points

Outcome measure

Measurement timepoints & methods


Primary outcome

Proportion of participants obtaining influenza vaccination during the study

• Study completion1 (via self-reports and clinical audit)

Secondary outcome

Proportion of participants visiting the University Health Service during the study

• Study completion1 (via self-reports and clinical audit)

Ancillary outcomes

Proportion of participants experiencing symptoms of influenza-like illness 2 (ILI) during the study

• Monthly from study commencement in May to October 2010 (via self-reports)

Proportion of participants using medications or remedy due to ILI symptoms 2

• Monthly from study commencement in May to October 2010 (via self-reports)

Proportion of participants visiting a healthcare professional due to ILI symptoms 2

• 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 2

• 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 completion1 (via self-reports)

Patterns of usage and feedback of PCHMS

• Study completion1 (via automatic system logs, data entered by participants into PCHMS, and self-reports)


1Estimated end of average respiratory disease and influenza season in Southern Hemisphere (i.e. October 2010, six months from study commencement)

2Defined 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 26 March 2010

Lau et al. BMC Health Services Research 2012 12:86   doi:10.1186/1472-6963-12-86

Open Data