Flashcards in Interpreting evidence Deck (10)
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1
name some different data types
numerical data: continuous, discrete
categorical data: ordinal, nominal
2
when is standard deviation more appropriate
when the data is not skewed
if skewed then use an interquartile range
3
what does 25th percentile mean
25% of data lies below this value
4
what is standard deviation
determines how far from the mean value each individual value is and summarizing this difference across all observations
5
what does positively skewed mean
the data lies towards the lower end of the scale
6
what is the event rate
the number of people experiencing an event as a proportion of the number of people in the population
7
what is the relative risk reduction
the difference in event rates between two groups, expressed as a proportion of the event rate in the untreated group
usually constant across populations with different risks
8
what is the absolute risk reduction
the arithmetic difference between 2 event rates
varies with the underlying risk of an event in the individual patient
becomes smaller when event rates are low (e.g. low risk patients vs high risk patients)
9
what is the number needed to treat
the number of patients who would have to receive a treatment for one of them to benefit
calculated by 100/ absolute risk reduction (percentage)
10
