How Do You Know That Your Care Is Improving? Part I: Basic Concepts in Statistical Thinking

Measurement is critical to improving quality, but it can be counterproductive to mix measurement methods appropriate for basic research with measurement methods needed for documenting process improvement in health care delivery. This article describes some basic statistical concepts needed to develop and implement a simple process improvement plan and a simple tool for assessing the effectiveness of interventions. The approach described can be used to improve operational or clinical processes.