Common indices for the quantal assessment of treatment efficacy are reviewed.
The absolute risk reduction is a practical index for public health considerations.
Its reciprocal has been termed the'Number Needed to Treat' (NNT), representing the health effort that must on average be expended to accomplish one tangible treatment target.
We extend the NNT to evaluate outcome combinations of treatment benefits versus treatment harms.
We describe the mathematical context of the NNT, and extend it to evaluate outcome combinations (treatment success/failure with/without treatment-induced adverse effects) in a treated population.
These extensions are carried out assuming either independence or positive association between treatment benefit and treatment harm.
A method is provided for calculating the standard errors of these extended NNT values.
Applications to cost-effectiveness analysis are discussed.
We calculate NNT in three recent therapeutic studies.
The results of a trial of the prevention of strokes with warfarin in patients with non-valvular atrial fibrillation are analysed to evaluate treatment success (stroke prevention) against treatment-induced bleeds.
An NNT-related cost-benefit analysis is also carried out.
We also analyse the results of a study of two modalities of chemotherapeutic treatment in small-cell lung cancer, and of two modalities of surgical intervention in the treatment of cholelithiasis.
Mots-clés Pascal : Efficacité traitement, Toxicité, Evaluation, Méthode étude, Analyse coût efficacité, Economie santé, Homme, Analyse mathématique
Mots-clés Pascal anglais : Treatment efficiency, Toxicity, Evaluation, Investigation method, Cost efficiency analysis, Health economy, Human, Mathematical analysis
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0385854
Code Inist : 002B30A01C. Création : 10/04/1997.