![]() These are studies that may point to statistical associations between exposure and outcome that need other models to prove the casualty of these associations. They have as main biases those of selection, memory and information. However, they are often long and therefore expensive studies. These types of studies have as advantages the possibility of measuring several exposure factors and outcomes, both primary and secondary, for both relatively frequent outcomes and rare exposure factors. ![]() Cohort studies may be retrospective or prospective, and both assume that the researcher will follow a population over time to seek a possible association between exposure (s) and outcome(s). In health sciences, the epidemiological method can be divided into descriptive and analytical epidemiology and the latter being divided into observational (cross-sectional study, case-control study and cohort study) and experimental studies. VIISchool of Application, Federal University of Acre, Rio Branco, Acre, Brazil VICenter for Health and Sports Sciences, Federal University of Acre, Rio Branco, Acre, Brazil VStricto Sensu Graduate Program in Health Science in the Western Amazon, Federal University of Acre, Rio Branco, Acre, Brazil IVNational Institute of Science and Technology EpiAmo / Rondônia IIICenter of Tropical Medicine of Rondônia, Porto Velho, Rondônia, Brazil IIDepartment of Medicine, São Lucas University Center, Porto Velho, Rondônia, Brazil IInstitute of Biomedical Sciences, University of São Paulo, Monte Negro, Rondônia, Brazil Luís Marcelo Aranha Camargo I, II, III, IV, V Romeu Paulo Martins Silva V, VI Dionatas Ulises de Oliveira Meneguetti V, VII ![]() Research methodology topics: Cohort studies or prospective and retrospective cohort studies
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