Biostat Flashcards
1
Q
External variable that impacts the effect of a risk factor (ie FHx of cancer)
A
Effect modifier
2
Q
1 SD includes what %?
A
68%
3
Q
2 SD includes what %
A
95%
4
Q
3 SD include what %
A
99.7%
5
Q
What is the null hypothesis?
A
That there is no relationship b/w exposure and outcome
6
Q
Which values are dependent on dz prevalence in the population?
A
PPV and NPV
High prevalence - good PPV
Low prevalence - good NPV
7
Q
The narrower the confidence interval
A
The more precise the result
8
Q
NPV is 96%, so if a pt has a negative test what is their risk of having dz?
A
4%
