Biostatistics Study Design

Biostatisticians are not in high demand in the job market.

The field of biostatistics is not growing rapidly.

Cohort studies are used to determine prevalence.

Modern biomedical technologies have created fewer challenges for biostatisticians.

Sample size is a consideration in study design.

Biostatisticians do not work at the interface of statistics with biomedicine.

Cohort studies measure events in reverse chronological order.

Statistics is not referred to as the grammar of science.

Cohort studies are used to determine the prevalence of a condition.

The incidence rate of HIV infection in the given population is 2.8% per year.

Cross-sectional studies are used to determine the incidence of a condition.

The incidence proportion is calculated by dividing the number of cases by the number of years.

Cohort studies can be prospective or retrospective.

Knowing the prevalence of a condition is not important for a clinician.

The prevalence of a disease is the number of new cases reported in a population over a certain period of time.

The formula for calculating prevalence is (number of affected people / total population) * 100.

In the given example, the prevalence of the disease is 10%.

Point prevalence measures the number of cases of a health event over a 12-month period.

Incidence is a measure of the number of existing cases of a disease in a population.

There are only two ways to calculate prevalence in epidemiology.

Incidence is a measure of the number of cases of a health event in reference to the total lifetime.

A stable number of new cases of a disease will lead to a decrease in prevalence over time.

Biostatisticians work at the interface of statistics with biomedicine to solve important design and analysis questions.
The field of biostatistics is growing rapidly, creating new challenges and opportunities, and biostatisticians are in high demand.

The objective of a study is to determine the rational of the study, sample, and expected outcomes.
Study design involves type of study, sample size, and power analysis.

Prevalence looks at existing cases, while incidence looks at new cases.
Prevalence can be calculated as a percentage using the formula: (number of cases / population size) x 100.
Incidence can be calculated as a proportion or rate, such as cases per 1,000 person-years.

Point prevalence: The number of cases of a health event at a certain time.
Period prevalence: The number of cases of a health event in a specific time period.
Lifetime prevalence: The number of cases of a health event in reference to the total lifetime.

Cohort studies are the best method for determining incidence and natural history of a condition.
Cohort studies can be prospective or retrospective and may involve comparing two cohorts.

Cross-sectional studies are primarily used to determine prevalence.
Prevalence is important for clinicians because it influences the likelihood of a diagnosis and the predictive value of an investigation.