Confounding involves error in the interpretation of what may be an accurate measurement by attributing it to the wrong cause. A confounder is a factor that is prognostically linked to the outcome of interest and is unevenly distributed between the study groups
Bias is the systematic distortion of the estimated intervention effect away from the "truth", caused by inadequacies in the design, conduct, or analysis of a trial
Incidence = number of individuals who develop a disease in a given period of time. Prevalence = the current number of cases in a given population
Linear regression and correlation used to compare the relationship between two variables where the relationship appears to be continuous (e.g. tachycardia and blood loss)
Different systems of categorising the quality of evidence, and individual studies, have been developed; primarily used in evidence-based clinical guidelines
Measures of Central Tendency; these indices allow a sample or population to be summarised using a single value.
An odds ratio (OR) is a measure of association between an exposure and an outcome. The OR represents the odds that an outcome will occur given a particular exposure, compared to the odds of the outcome occurring in the absence of that exposure.
It is unethical and a waste of time and resources to embark on a study when there is a high chance of a false negative result (Type II error). The commonest cause of this is having a sample size that is too small
Qualitative data consists of categorical measurements determined by description rather than a numerical measurement
John Snow (1813-1858) was an English physician. Snow is considered one of the fathers of modern epidemiology (the cholera cartographer); and a leader in the development of anaesthesia, medical hygiene and public health.
Reviewed and revised 26 October 2016 OVERVIEW Obesity has significant implications for the assessment, management, and outcomes of trauma The relationship between obesity and negative outcome from injury has been controversial INJURY PATTERNS Obese patients tend to have lower overall…
Initial Trauma Assessment: ATLS approach