Longitudinal Changes in Prevalence of Colorectal Cancer in Farm and Non-Farm Residents of Saskatchewan

Objective: To determine predictors associated with longitudinal changes in colorectal cancer (CRC) prevalence in farm and non-farm rural residents in Saskatchewan, Canada. Methods: Data from the Saskatchewan Rural Health Study were collected from 8261 individuals nested within 4624 households at baseline survey in 2010 and 4867 individuals (2797 households) at follow-up survey in 2014. The study sample consists of 5599 individuals (baseline) and 3933 at (follow-up) (more than or equal to 50 years). Results: The prevalence of CRC increased over time among rural farm (baseline: 0.8%; follow-up: 1.3%, P< 0.05) and non-farm (baseline: 1.4%; follow-up: 2.0%, P> 0.05) residents. Longitudinal predictors of CRC prevalence were: quadrant, location of home, mother ever had cancer, age, body mass index (BMI), sex, radiation, natural gas. Conclusions: Longi-Longitudinal changes in prevalence of CRC among farm and non-farm residents appear to depend on a complex combination of individual and contextual factors.