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Vol. 17 - Num. 65

Critical appraisal in small doses

Propensity score analysis. The desire to resemble clinical trials

Manuel Molina Ariasa

aServicio de Gastroenterología Pediátrica. Hospital Universitario La Paz. Madrid. España.

Correspondence: M Molina. E-mail:

Reference of this article: Molina Arias M. Propensity score analysis. The desire to resemble clinical trials. Rev Pediatr Aten Primaria. 2015;17:87-90.

Published in Internet: 17-03-2015


Observational studies lack randomization. Therefore, there is no assurance that the different study groups have the same distribution of baseline covariates, which has the consequence that results cannot be compared directly without performing some form of adjustment for confounding or modifying effect.

In this paper the use of propensity scores is described as an alternative method to the classic use of adjustment by logistic regression.


Logistic regression Propensity score Randomization



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