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Biases can arise at various stages of research, from study design and data collection to analysis and interpretation. Recognizing and addressing these biases is essential to ensure the validity and reliability of epidemiological findings.Broadly speaking, biases in epidemiology fall into three main categories: selection bias, information bias, and confounding. A more detailed description of possible biases is:  
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Gun violence in Australia, 2002-2016: a cohort study.

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Firearm injuries in New South Wales declined between 2002-2016, with self-harm highest in older adults and rural areas. Assault injuries were more common in younger people and cities.

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Area of Science:

  • Public Health
  • Epidemiology
  • Injury Prevention

Background:

  • Firearm-related violence presents a significant public health challenge.
  • Understanding the epidemiology of firearm injuries is crucial for targeted prevention strategies.

Purpose of the Study:

  • To describe the burden, geographic distribution, and outcomes of firearm-related violence in New South Wales (NSW) from 2002 to 2016.
  • To analyze trends and identify high-risk populations for firearm injuries.

Main Methods:

  • A population-based record linkage study was conducted in NSW.
  • Data from January 1, 2002, to December 31, 2016, were analyzed.
  • Injury rates were examined by intent (assault, self-harm, accidental), demographics, and geographic location, correlating with licensed gun ownership.

Main Results:

  • 2390 firearm-related injuries were recorded: 36% assault, 33% self-harm, 21% accidental.
  • Overall injury rates declined from 3.4 to 1.8 per 100,000 population.
  • Self-harm rates were highest in individuals aged 60+ (41.5 per 100,000) and strongly correlated with licensed gun owners (r=0.94).
  • Higher rates of firearm injuries were observed in outer regional/rural/remote areas compared to major cities.

Conclusions:

  • Firearm self-harm rates are elevated in older adults, men, and rural residents.
  • Assault-related firearm injuries are more prevalent among younger individuals and urban populations.
  • Prevention strategies should be tailored to specific at-risk groups and geographic locations.