Measures of Occurrence Flashcards
Describes a single population
Frequencies
a single number
Counts
One numerator, one denominator
Ratios
The numerator is a subset of the denominator
Proportion
The number of new events occurring in a specified period in a defined population
Incidence
Measures of incidence are:
Cumulative incidence (risk) and incidence density (true rate)
Number of new cases / total population
Cumulative incidence (risk)
number of new cases / person-time-at-risk
Incidence density (true rate)
Measures the disease burden in the population
Prevalence
Affected by new cases occurring and duration of outcome (rate of recovery and death).
Prevalence
number of cases (new and existing) / total population
Prevalence
Cumulative Incidence measures __________
Risk
Cumulative Incidence numerator is _______
new cases
Cumulative Incidence denominator is _______
Population at risk
Cumulative Incidence population is ____
closed cohort
Cumulative Incidence numeric range is _____
0 to 1
Cumulative Incidence unit is ___________
Dimensionless, time specified
Incidence Density measures ________
Rate
Incidence Density numerator is ________
New cases
Incidence Density denominator is ________
Person-Time of Observation
Incidence Density population is ___________
Open or Closed Cohort
Incidence Density numeric range is ______
0 to ∞
Incidence Density unit is __________
Per unit time
unadjusted measure of occurrence
Crude (unadjusted)
hypothetical measure of occurrence that would have occurred had the observed rates prevailed in a population with a distribution of that of the standard population, e.g. age-adjusted mortality rates
Adjusted
the measure of occurrence within a specific stratum (e.g. women) of the population
Stratum-specific
