Flashcards in Interpreting evidence Deck (10):

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