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Pseudonymisation is a process that removes or replaces information that identifies an individual within a data set. This may involve replacing names or other identifiers with a less easily recognisable reference number. 


A condition caused or aggravated by a mental factor such as internal conflict or stress



Measured by the quality of something rather than its quantity 

Qualitative research

Qualitative research is used to explore and understand people's beliefs, experiences, attitudes, or behaviours. It asks questions about how and why a "quality" is being measured by the research. Often the term "holistic" is used, meaning that the complexities of human behaviour are preserved in the study. Qualitative research might ask questions about why people want to stop smoking. It would not ask how many people have tried to stop smoking. It does not collect data in the form of numbers. Qualitative researchers use methods like focus groups and interviews.

Quality-adjusted life year

A numerical measurement that combines quality of life and life expectancy

Quality-adjusted life years

a numerical measurement that combines quality of life and life expectancy


Measured by the quantity of something rather than its quality 

Quantitative research

In quantitative research, researchers collect data in the form of numbers. So they measure things or count things a "quantity" is being measured. Quantitative research might ask a question like how many people visit their GP each year, or what proportion of children have had an MMR vaccine, or whether a new drug lowers blood pressure more than drugs that are usually used. Quantitative researchers use methods like surveys and clinical trials



Randomisation randomly assigns patients to a control group or treatment group in clincial trials. It removed bias from trials, which could make the test unreliable.


A person who is appointed by an organisation to report on the proceedings of its meetings.

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