Lecture 27

Question 1

Screening in health

Answer 1

Involes identifying risk factors for disease or unrecognised disease by applying test on a large scale to a population

Question 2

Primary prevention:

Answer 2

Screening women for alcohol intake to prevent breast cancer (preventatitve)

Question 3

Secondary eg:

Answer 3

Screening for breast cancer

Question 4

Screening criteria suitable disease

Answer 4

1. An important public health problem

2. Knowledge of the natural history of the disease (detectable early)

Question 5

Suitable test:

Answer 5

must be safe, simple, affordable, accuracy

Question 6

The sensitivity of a screening test is high if

Answer 6

the proportion of true positives is high

Question 7

The specificity is high if:

Answer 7

the proportion of true negative is high

Question 8

Positive predictive value (PPV)

Answer 8

The proportion who really have the disease of all people who test positive.

The probability of having disease if the test is positive.

Question 9

Negative predictive value

Answer 9

The proportion who are actually free of the disease of all people who test negative.

The probability of not having the disease if the test is negative.