 |
Bernal-Delgado
E, Galeote-Mayor M, Pradas-Arnal F, Peiro S. Evidence-based educational outreach visits:
Effects on prescription of non-steroidal anti-inflammatory drugs. JECH 2002; 56: 653-8.
This study provides a model to analyse two of the designs presented and to discuss the
threats to internal and external validity present in both. The study behaves like a pretest-postest design with an equivalent
group for the main variable (changes in prescription behaviour), and like a time series
composed of equivalent groups for the secondary variable (change is cost per
prescription). |
