Geographical Variation in Adherence to Cancer Prevention Recommendations Among Individuals Undergoing Surveillance Colonoscopy
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1. College of Medicine and Public Health, Flinders University, Adelaide, Australia
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2 Department of Public Health, Debre Tabor University, Debre Tabor, Ethiopia
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3 Gastroenterology Department, Southern Adelaide Local Health Network, Adelaide, Australia
Popul. Med. 2026;8(Supplement Supplement 1):A2961
ABSTRACT
INTRODUCTION:
non-communicable disease (NCDs), including colorectal cancer (CRC), remain a major public health priority. Health behaviours and lifestyle modification are central to reducing disease burden. The world cancer research fund/american institute for cancer research (WCRF/AICR) recommendations provide an evidence-based framework for cancer prevention; however, adherence varies across population groups and geographical areas. Understanding geographical disparities in behavioural, dietary, and lifestyle adherence among individuals at elevated CRC risk is essential for strengthening NCD prevention strategies and advancing health equity. This study examined geographic variation in adherence to cancer prevention recommendations among individuals undergoing surveillance colonoscopy in South Australia.
METHODS:
a cross-sectional study was conducted among individuals undergoing surveillance colonoscopy due to family or personal history of CRC. Three adherence indices were developed on cancer prevention
RECOMMENDATIONS:
a behavioural adherence index (BeAI), a dietary adherence index (DietAI), and a healthy lifestyle adherence index (HLAI), incorporating body size, alcohol intake, physical activity, diet, and smoking. Bayesian conditional autoregressive reroux models were fitted to quantify spatial dependence. Posterior means and 95% credible intervals were reported.
RESULTS:
1961 participants completed the survey. Significant spatial clustering was observed for all three adherence indices (moran’s I < 0.05). Mean BeAI, DietAI, and HLAI were higher in metropolitan areas (2.33, 1.98, and 4.31, respectively) than in non-metropolitan areas (2.23, 1.90, and 4.14, respectively). BeAI was associated with higher socioeconomic advantage and a higher number of prior colonoscopies. DietAI was associated with female sex and younger age, and HLAI was also higher among females. These findings highlight clear spatial and demographic variability in adherence patterns.
CONCLUSIONS:
Adherence to cancer prevention recommendations varied geographically among individuals at elevated risk. Identifying the geospatial and socioeconomic factors driving these disparities can inform targeted NCD prevention, precision public health planning and equity-focused cancer prevention strategies.