Sequential controlled clinical trials
Regarding our previous article on controlled clinical trials, this essay extends the discussion to the classification of sequential controlled trials.
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Month: April 2019
Classifications of clinical trials
Clinical trials are divided into two groups of parallel and sequential controlled studies. This article explains the features related to parallel studies.
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Interventional studies
Interventional studies, which are considered the gold standard for effectiveness research, can strongly address the causality of between two variables.
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Cohort studies
Prospective cohort studies are designed in a way that the two investigated groups are classified based on their exposure status and risk factors. In the next step, the samples are studied over time to evaluate and compare the outcomes in both groups.
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Cross-sectional studies
Cross-sectional studies have several names, including cross-sectional studies, surveys, and Prevalence study, Epidemiological study.
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Observational studies
The main aim of these studies is not only to describe and express the status of the present situation, but also to identify and compare the relationships between two or more variables and their impact in different groups.
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Data Measurement Scale
There are four types of scales to measure the data. Each qualitative or quantitative variable will be measured with one of the following scales:
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The use and importance of variables:
The research intends to achieve goals. To pursue the goals, you need variables that make the process of goal setting possible to identify which results in the achievement of the goals. The variables are from diffent types in term of their relationship with each other and also in term of their type of measurement.
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