Glossary

a priori hypothesis: research question that is defined prior to data collection and/or data analysis.

Effectiveness trial: larger-scale research study to determine the impact of an intervention under more representative field conditions or with more representative community-based samples of participants.

Efficacy trial: small scale research study designed to assess interventions under researcher-controlled settings.

Mediator: hypothesized pathway or process through which an intervention is expected to achieve its effects