Comparisons that start with the identification of persons with the disease or outcome of interest and a control (comparison, referent) group without the disease or outcome of interest. The relationship of an attribute is examined by comparing both groups with regard to the frequency or levels of outcome over time.
    

concept

The health and physical development of idiots as compared with mentally sound children of the same age / G.E. Shuttleworth.

The efficacy of B. C. G. vaccination : a study on vaccinated and tuberculin negative non-vaccinated conscripts / by Gunnar Dahlström and Hans Difs ; with a foreword by Arvid Wallgren.

The pocket guide to critical appraisal / by Iain K. Crombie.

Development in relation to brain and nutrition.

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The health and physical development of idiots as compared with mentally sound children of the same age / G.E. Shuttleworth.

The efficacy of B. C. G. vaccination : a study on vaccinated and tuberculin negative non-vaccinated conscripts / by Gunnar Dahlström and Hans Difs ; with a foreword by Arvid Wallgren.

The pocket guide to critical appraisal / by Iain K. Crombie.

Development in relation to brain and nutrition.