NBDHE NBDHE Community Oral Health Principles 2

Question 1

Which index is used to measure the prevalence and severity of periodontal disease in epidemiological studies?

Accepted Answer

Community Periodontal Index (CPI)

Answer

The Community Periodontal Index (CPI) is the WHO-recommended tool for measuring periodontal conditions in population surveys.

Question 2

A community water fluoridation program is considered which level of prevention?

Accepted Answer

Primary prevention

Answer

Water fluoridation is primary prevention because it prevents disease before it occurs in the population.

Question 3

The 'iceberg concept' in epidemiology refers to:

Accepted Answer

The visible cases of disease representing only a fraction of total cases

Answer

The iceberg concept illustrates that clinically apparent disease cases are far fewer than the total cases existing in a population.

Question 4

Which sampling method ensures every member of a population has an equal chance of being selected?

Accepted Answer

Simple random sampling

Answer

Simple random sampling gives every individual an equal and independent chance of selection, minimizing selection bias.

Question 5

Sensitivity of a screening test refers to its ability to:

Accepted Answer

Correctly identify those with the disease

Answer

Sensitivity is the proportion of true positives correctly identified (true positive rate) among all diseased individuals.

NBDHE Test Practice Test