EPIDEMIOLOGY

Question 1

TERMINOLOGIES IN EPIDEMIOLOGY

Answer 1

** TESTS** ** DISEASE ** ** NO DISEASE **
Test +ve (a) True +ve (b) False+ve
Test -ve (c) False -ve (d) True-ve
Sen SI tivity: ability to truly detect the disease (a/a+c)
Speci FI city : ability to detect those who are FIT (d/b+d)
Positive predicitive value :(a/a+b)
Negative predictive value:(c/c+d)

Question 2

RELATIVE RISK, ABSOLUTE RISK , RELATIVE RISK REDUCTION AND ABSOLUTE RISK REDUCTION

Answer 2

1. RELATIVE RISK : Incidence among exposed/ Incidence among non exposed
2. ABSOLUTE RISK : Incidence among exposed/ total exposed
3. ABSOLUTE RISK REDUCTION : Absolute risk control grp - Absolute risk Case grp.
4. RELATIVE RISK REDUCTION: Absolute risk control grp - Absolute risk case grp /Absolute risk control grp

Question 3

ODDS RATIO

Answer 3

AD/BC

Question 4

SENSITIVITY AND SPECIFICITY

Answer 4

Sensivity :High sensitive means low False negatives
Low sensitivity means high False negative

Specificity : High specificity means low false Positives
Low specifivity means high False positives