Proxy reporting of health information

Area of Science:

• Epidemiology
• Health Survey Methodology
• Biostatistics

Background:

• Proxy reporting, where data is provided by a substitute informant, is common in health surveys.
• Understanding the extent and impact of proxy reporting is crucial for accurate health surveillance.

Purpose of the Study:

• To quantify proxy reporting in Canada's National Population Health Survey (NPHS).
• To investigate the relationship between proxy reporting status and the prevalence and incidence of selected health conditions.

Main Methods:

• Utilized cross-sectional (1994/95-1998/99) and longitudinal (1994/95-2000/01) NPHS data.
• Compared health condition estimates between files with differing proxy reporting rates.
• Employed multivariate analyses on longitudinal data to assess reporting status changes and condition incidence.

Main Results:

• The 1998/99 Health file, with lower proxy reporting, showed higher estimates for certain health conditions compared to the 1998/89 General file.
• Decreasing proxy reporting rates over time correlated with increased health condition estimates.
• Longitudinal analyses indicated a potential "proxy effect" on the incidence of some health conditions.

Conclusions:

• Proxy reporting significantly influences the estimated prevalence and incidence of health conditions in the NPHS.
• Changes in reporting practices can alter observed trends in population health.
• Methodological considerations regarding proxy reporting are essential for interpreting NPHS findings.