Category Archives: Evidence sites

Evaluation and synthesis of studies using qualitative methods of analysis

Investigations of such questions as quality of life are usually undertaken by means of quantitative research methods, in the form of questionnaire-based numerical rating scales. When the aim of a study is to achieve a deeper understanding of a person’s subjective perception of – for example – quality of life, a person’s individual perceptions, experiences, impressions and actions, then qualitative research methods may be more relevant. Such methods offer an understanding of associations from the individual’s perspective.

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A Registry of Disability and Rehabilitation Systematic Reviews

If you are searching for evidence around disability or rehabilitation, check out this systematic review registry managed by the Center on Knowledge Translation for Disability and Rehabilitation Research (KTDRR).

Registry of Systematic Reviews of Disability and Rehabilitation Research

Prodigy replaces CKS

Prodigy(formerly the Clinical Knowledge Service) is now being provided by Clarity Informatics.    Prodigy can be found at

Number Needed to Treat

There is a way of understanding how much modern medicine has to offer individual patients. It is a simple statistical concept called the “Number-Needed-to-Treat”, or for short the ‘NNT’. The NNT offers a measurement of the impact of a medicine or therapy by estimating the number of patients that need to be treated in order to have an impact on one person. The concept is statistical, but intuitive, for we know that not everyone is helped by a medicine or intervention — some benefit, some are harmed, and some are unaffected. The NNT tells us how many of each. Visit The NNT.

Read David Rothman’s review here.

News from BMJ’s Best Practice

The Clinical Evidence systematic reviews are now available for you to access within Best Practice.