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There are currently several classifications for levels of evidence. The following is a classification cited in the Journal of Neurosurgery (Editorial. JT Rutka).Evidence LevelDescriptionIi) Randomised...

. ReferencesShahar D, Sayers MG. A morphological adaptation? The prevalence of enlarged external occipital protuberance in young adults. J Anat. 2016;229(2):286-291. doi:10.1111/joa.12466...

Overview Mode, modal class and modal category are similar statistics that relate to the 'most popular' data point within data-sets. Mode If the data that you have collected is numerical, the mode is t...

Overview Descriptive statistics is a collection of statistical tests that describe the basic statistics of the data. Table 1 summarises the statistics that constitute descriptive statistics. Table ...

Normal distribution is a type of statistical distribution. It is also called Gaussian distribution. When you plot the data which has a normal distribution against its frequency (e.g. height on the x-a...

All the time when we undertake research or audit we collect data. The data may be simple such as age of patients or gender of patients. The data we collect may be complex: the Glasgow Coma score at ad...

Introduction Statistical calculations often appear mystical as though plucked from mid-air. Statistical calculations are in fact based on the mathematical pattern of events. These mathematical pattern...

DefinitionHemispheric hypodensity (HH) or 'black brain' on CT scan of the head following severe head injury in infants and toddlers.It is characterised by:loss of grey-white differentiation of the aff...

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