Screening

What level of prevention will Screening be considered as?

• Primordial

• Primary

• Secondary

• Tertiary

Correct statement among the following is?

• Sensitivity depends on prevalence

• Specificity depends on prevalence

• If sensitivity is high, then there is lesser chance of disease among the population

• Positive predictive value depends on the prevalence

Screening tests should be

• Costly

• Easy to perform

• Difficult to perform

• More specific

Lead time refers to the time between

• Disease onset and first critical diagnosis

• Disease onset and first possible point of detection

• First possible point of detection and final critical point

• First possible point of detection and usual time of diagnosis

Which of the following regarding Genetic Screening is true

• Screening tests defines risk of passing genetic disorder

• Screening tests are more accurate than diagnostic tests

• Screening requires genetic mapping

• Usually involves invasive procedures

Diagnostic power of the test is reflected by?

• Sensitivity

• Specificity

• Predictive value

• Population Attributable Risk

A doctor orders for 6 tests for SLE. Which of the following is needed for inference

• Prior probability of SLE, Sensitivity, Specificity

• Incidence of SLE and Predictivity of each test

• Incidence and Prevalence of SLE

• Relative risk of SLE in the patient

The above picture shows normal and diabetic blood sugar level with diagnostic cut off at 120 mg/dL. What does the shaded area C represent

• True Positive

• True Negative

• False positive

• False negative

A new method of measuring Hb level is developed. Ten readings show 9.4, 10.4, 9.6, 9.1, 10.8, 12.1, 10.1, 9.8, 9.2, 9.5. Hb using the standard method is 10.2. The given method is

• Low validity, Low reliability

• Low validity, High reliabity

• High validity, Low reliability

• High validity, High reliability

What is External Validity of a study?

• Replicability

• Generalization

• Objectivity

• Causality