All of the following are factors that make cohort studies the most powerful of the observational studies, EXCEPT: Group of answer choices study involves at least two observation points allows for calculation of disease rates (incidence) moves from cause to effect useful with rare diseases

seen in the explanation

Explanation:

The factors which we are supposed to choose from is not seen here, so let me explain factors that makes cohort studies the most powerful in observational studies.

Firstly, The word cohort means a group of people with defined characteristics who are followed up to determine incidence or, of mortality from, some specific disease, all causes of death, or some other outcome. While Cohort studies are a type of medical research used to investigate the causes of disease and to establish links between health outcomes and risk factors.

cohort studies have a temporal framework to assess causality and thus have the potential to provide the strongest scientific evidence because an outcome or disease-free study population is first identified by the exposure or event of interest and followed in time until the disease or outcome of interest occurs (exposure is first identified before the onset of disease in prospective cohort studies). Cohort studies examines rare exposures because subjects are selected by their exposure status and investigators can examine range of outcomes caused by one exposure simultaneously.

Cumulative incidences can be calculated using data collected from cohort studies, which are the most direct measurement of the risk of developing disease.

the answer is b. 0; 4