Skip to main content

Blinding Technique In Epidemiological Studies

Bias may arise from errors of assessment of the outcome due to human element. For example, if a patient knows about the research, he may deliberately conceal some important points which may affect the results of the study. In order to reduce this problem, a technique known as "blinding" is adopted, which will ensure that the outcome is assessed objectively.
1. Single Blind Trial
This trial is planned in such a way that the participants (patients or study population) are not aware whether they belong to study group or control group.

2. Double Blind Trial:
This trial is so planned that neither the doctor nor the participant is aware of the group allocation and the treatment received.

3. Triple Blind Trial:
This is one step further. The participant, the doctor and the person analysing the data are all blind. Ideally triple blinding should be used but the double blinding is the most commonly used method. In some cases blinding is not so important for example when an outcome such as death is being measured.


Popular posts from this blog

Human Parasites, Types of Parasites, and Classification

Parasite: A parasite is a living organism which gets nutrition and protection from another organism where it lives. Parasites enter into the human body through mouth, skin and genitalia. In this article, we will generally discuss the types and classification of parasites. It is important from an academic point of view. Those parasites are harmful, which derives their nutrition and other benefits from the host and host get nothing in return but suffers from some injury. Types of Parasites Ecto-parasite: An ectoparasite lives outside on the surface of the body of the host. Endo-parasite: An endo-parasite lives inside the body of the host, it lives in the blood, tissues, body cavities, digestive tract or other organs. Temporary parasite: A temporary parasite visits its host for a short period of time. Permanent parasite: Permanent parasite lives its whole life in the host. Facultative parasite: A facultative parasite can live both independently and dependently. It lives in the

How to taper off, wean off beta blocker, atenolol, Propranolol, Metoprolol

Beta blockers include, atenolol (Tenormin), propranolol (Inderal ) and metoprolol (Lopressor) and are used to treat high blood pressure, certain cardiac problems, migraine and few other conditions. People usually take atenolol, propranolol or metoprolol for many years as a treatment of high blood pressure or after having an episode of heart attack . Sometimes, it becomes necessary to withdraw these beta blockers due to their potential side effects that trouble the patients or sometimes doctor wants to change the drug and shift the patient to some other anti-hypertensive medicine. No matter whatever the cause is, whenever, a patient who has been using a beta blocker for a long period of time, and he needs to be stopped from further usage of that beta blocker, must not stop taking it. One should taper off the dose of a beta blocker. Now a question arises how to wean off or taper off a beta blocker? The method of tapering off beta blocker varies from individual to individual. Allow you