Use different national surveys for the numerator and denominator in estimating the incidence rates and the confidence intervals of a variety of injuries
A common epidemiological research problem is that desired information often resides in different surveys. Few national data sources record injury case and exposure at the same time, making estimation of incidence rates difficult. Among the few which document both such as the National Health Interview Survey (NHIS), the available information (e.g. injury and time exposed) is constrained by the questionnaires’ content. We sought to overcome these limitations by developing a procedure to use different national surveys for the numerator and denominator in estimating incidence rates and confidence intervals (C.I.) for a variety of injuries.
The 2010 National Health Interview Survey (NHIS) was used for the injury outcomes, and the 2010 American Time Use Survey (ATUS) for time of exposure. We used work-related and sport-related injuries as examples respectively. The incidence rate was estimated by dividing the number of population-level injuries (from NHIS) by population-level exposure (ATUS); the population totals were calculated with appropriate sampling weights. The standard error, and hence confidence intervals, were calculated using Taylor Linearization (Delta method), which took the complex survey structures into account.
In 2010, the incidence rate for work-related injuries was 1.44 per 100,000 hours (C.I. = (1.10, 1.77)). For sport-related injuries, the incidence rate (and C.I.) was 13.36 per 100,000 hours (C.I. = (11.38, 15.38)).
This procedure makes it possible to estimate the incidence rates and 95% confidence intervals even when the numerator and denominator come from different data sources, offering an alternative approach for injury surveillance and research when data availability is constrained.
Learning Areas:Biostatistics, economics
Occupational health and safety
Public health or related research
Describe a procedure to use different national surveys for the numerator and denominator in estimating incidence rates and confidence intervals (C.I.) for a variety of injuries.
Keyword(s): Methodology, Epidemiology
Qualified on the content I am responsible for because: I have been conducing injury research since 2011. I also hold an M.S. in applied mathematics, receiving extensive mathematical & statistical training.
Any relevant financial relationships? No
I agree to comply with the American Public Health Association Conflict of Interest and Commercial Support Guidelines, and to disclose to the participants any off-label or experimental uses of a commercial product or service discussed in my presentation.