From "Failure of a Continuous Quality Improvement Intervention To Increase the Delivery of Preventive Services. A Randomized Trial" Effective Clinical Practice, May/June 2000. 3:105-115.
Figure 1. Flow diagram of the randomized, controlled trial. Use of preventive services was assessed on different samples of patients at baseline and at follow-up. At each clinic, 175 patients who had primary care visits during a 5-week period were selected for evaluation. Patients reported whether they had received eight preventive services, and medical charts were reviewed to see whether patients received these services in the 3 months after their primary care visits. . CQI = continuous quality improvement; QI = quality improvement.