Public health and stats Flashcards
What does a 95% confidence interval mean?
A range of values in which we are 95% certain that the true value lies (measure of certainty rather than probability)
How do you calculate number needed to treat (NNT)?
Calculate absolute risk reduction (the difference between the risk values).
NNT is calculated by dividing 1 by ARR
What is it called when the null hypothesis is rejected when it is true?
Type 1 error
What does generalisability mean?
The extent to which the results of a study can be applied to other settings
How do you calculate relative risk?
Risk in each category: effect/effect+no effect
divide one category by another to determine relative risk
How do you calculate the odds ratio?
Compares the intervention with the control vs comparing the negative intervention with the control
What measure of association is used in cross-sectional studies?
Odds ratio
