Study Design Elements

Study Design Element 1: Identify the Population

The first key element in study design that uses observation of individuals is to identify the population that is the study base.

Study Design Element 2: Sampling

The second key element in study design is best thought of as ways of sampling the disease experience of a cohort or study base or reference population.

Study Design Element 3: Timing of Measurements

The third key element in study design is the timing of measurements of the predictor variables and the outcome variables relative to the time period of the experience of the study base.

Confusion About Timing of Measurements

There is much confusion around applying the terms retrospective and prospective to study designs.

Jeff Martin, MD

-- MaryB - 12 Feb 2009