stats

Question 1

level 1

Answer 1

3 RCTs
meta-analysis of all relevenat RCTs

Question 2

level 2

Answer 2

1 large RCT

Question 3

level 3

Answer 3

controlled trials without randomisation

Question 4

level 4

Answer 4

case control or cohort

Question 5

level 5

Answer 5

systematic qualititive

Question 6

level 6

Answer 6

single qualititive

Question 7

relative risk >1

Answer 7

increased risk in exposed groups

Question 8

relative risk of 0.8

Answer 8

risk in exposed group is 20% lower than the unexposed group

Question 9

how prevalence affects PPV

Answer 9

low prevalence may have a low PPv despite high spec and sensitivity

Question 10

OR <1

Answer 10

exposure is associated with a lower odds of outcome

Question 11

exposure is associated with a higher odds of outcome

Answer 11

OR>1

Question 12

type 1 error

Answer 12

rejecting the NH when it is true

Question 13

type 2 error

Answer 13

accepting the NH when it is false

Question 14

value towards 1 indicates low false positives

Answer 14

specificity- rules iN disease

Question 15

value towards 1 indicated low false negative

Answer 15

sensitivity - rules OUT disease

Question 16

how does prevalance affect PPV

Answer 16

low prevalance will have low PPV

Question 17

calaculating prevalence

Answer 17

incidence x disease duration

Question 18

how to calculate incidence

Answer 18

nos of new cases / number at risk in that time

Question 19

how to calculate prevalence

Answer 19

nos of total cases/ total population