“An expert is one who knows more and more about less and less until he knows absolutely everything about nothing.”

Design and Analysis of Clinical Trials... Clinical Trial Designs Lesson 3


Experimental design originated in agricultural research and influenced laboratory and industrial research before being applied to trials of pharmaceuticals in humans. Experimental design is characterized by control of the experimental process to reduce experimental error, replication of the experiment to estimate variability in the response and randomization. For example, in comparing the yields of two varieties of corn, the experimenter uses the same type of corn planter and the same fertilizer and weed control methods in each test plot. Multiple plots of ground are planted with the two varieties of corn. The assignment of a seed variety to a test plot is randomized.
Clinical trial design has its roots in classical experimental design, yet has some different features. The clinical investigator is not able to control as many sources of variability through design as a laboratory or industrial experimenter. Human responses to medical treatments display greater variability than observations from experiments in genetically identical plants and animals or measuring effects of tightly-controlled physical and chemical processes. Ethical issues are paramount in clinical research To study a clinical response with adequate precision, a trial may require lengthy periods for patient accrual and follow-up. It is unlikely to enroll all the study subjects on the same day. There is opportunity for study volunteers to decide to no longer participate.Each of these must be considered in extending classical experimental design to a clinical trial.
Let's get started!


Post a Comment

About Blogger:

Hi,I,m Basim from Canada I,m physician and I,m interested in clinical research feild and web development.you are more welcome in our professional website.all contact forwarded to basimibrahim772@yahoo.com.

Let's Get Connected: Twitter | Facebook | Google Plus| linkedin

Blog Tips

Subscribe to us