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Recruitment to a clinical trial improves glycemic control in patients with diabetes

Edwin A M Gale1, Scott D Beattie, Jinghui Hu

  • 1Department of Diabetes and Metabolism, University of Bristol, Bristol, UK. edwin.gale@bristol.ac.uk

Diabetes Care
|September 7, 2007
PubMed
Abstract

Insights

Enrollment in clinical trials improves glucose control in patients with diabetes, even without therapy changes. This effect, measured by A1C reduction, is more pronounced in individuals with initially poorer glycemic control.

Area of Science:

  • Endocrinology
  • Clinical Trials
  • Diabetes Research

Background:

  • Glycemic control is crucial for managing diabetes.
  • Clinical trial participation may influence patient outcomes independently of interventions.

Purpose of the Study:

  • To evaluate the impact of clinical trial recruitment on glycemic control (A1C) in patients with diabetes.
  • To determine if the screening and enrollment process itself affects A1C levels.

Main Methods:

  • Analysis of data from six clinical trials (3 for type 1 diabetes, 3 for type 2 diabetes) involving 1040 patients.
  • A1C levels were measured at screening and randomization, with no changes in pharmaceutical therapy prior to randomization.
  • Regression analysis was used to assess the change in A1C based on baseline A1C and the time between screening and randomization.

Main Results:

  • A modest reduction in A1C was observed: -0.13% for type 1 diabetes and -0.16% for type 2 diabetes.
  • Longer intervals between screening and randomization (≥28 days) showed greater A1C reductions (-0.24% for type 1, -0.23% for type 2).
  • A1C reduction was proportional to baseline A1C, with the most significant decreases seen in patients with the highest initial A1C levels.

Conclusions:

  • Clinical trial recruitment, separate from therapeutic interventions, leads to improved glycemic control.
  • The process of being enrolled in a study can positively influence diabetes management outcomes.

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