Introduction to Measures of Morbidity (Disease Frequency)

These flashcards cover key concepts related to measures of morbidity and disease frequency presented in the lecture.

Cumulative Incidence

The total number of new cases of a disease in a specified population at risk during a specified time period, expressed as a proportion or percent.

Incidence Rate

A measure of the occurrence of new disease, calculated as the number of new cases divided by the total person-time at risk during the specified time period.

Prevalence

The proportion of individuals in a population who have a particular disease at a given time, without consideration of whether they are at risk.

Attack Rate

The proportion of exposed individuals who develop the disease; a measure of risk among the exposed.

Secondary Attack Rate

The attack rate in susceptible people who are exposed to a primary case of disease.

Proportion

A type of ratio in which the numerator is included in the denominator, often expressed as a fraction, percentage, or decimal.

Probability

A quantitative assessment of the likelihood of an event occurring, measured as a value between 0 (never occurs) and 1 (always occurs).

Case Definition

A set of criteria used to determine whether an individual has a particular disease, which may include symptoms and laboratory findings.

Surveillance

Systematic data collection, analysis, and interpretation of health data for planning, implementing, and evaluating public health practices.

Epidemic Curve

A graphical representation that shows the onset of cases over time, which helps to understand the dynamics of an outbreak.