Educative Intervention to Improve Type 2 Diabetes Mellitus Control in Corrientes (PRODIACOR)

October 20, 2011 updated by: Centro de Endocrinologia Experimental y Aplicada

Programme of Diabetes Education in the City of Corrientes (PRODIACOR): Clinical, Metabolic and Economic Outcomes of a Prospective-randomized Trial Based on Different Patient-centered Educational Strategies for People With Type 2 Diabetes

Objective: To evaluate the effect of system interventions (data recording procedures and complete coverage of medications and supplies) with or without physician and/or patient education, upon the psychological, clinical, metabolic and therapeutic indicators and the costs of care of people with type 2 diabetes.

Design: Randomized 2x2 design; sample size was determined considering the change in haemoglobin A1c (primary outcome variable) using a two-sided test at the 5% level of significance, and 80% power using a paired t-test. Sample size was increased by 25% to account for non-independence and patient drop-out.

Setting: Primary care level in the city of Corrientes, Argentina with involvement of all three Argentinean health subsectors (public health, social security and the private, prepaid system).

Participants: 36 general practitioners and 468 adults (62-71% women, mean age 62 years) with type 2 diabetes. Patients of the participating physicians (nine in each group), were randomly selected and assigned to one of four groups (117 patients each): control, provider education, patient education, and provider/patient education.

Intervention: Structured group education programmes were delivered to provider and/or people with type 2 diabetes by trained professionals; identical system interventions were applied to all four groups.

Main outcome measures: Body mass index, blood pressure, fasting glucose, haemoglobin A1c levels, lipid profile, drug consumption, resource use, and patient well being (WHO-5 questionnaire and Lowe score), at baseline and up to 42 months at every 6 months intervals.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

The study protocol was evaluated and approved by an external ethical committee; patients gave informed consent to participate in the study according with the guidelines from the International Conference on Harmonisation and WHO good clinical practice standards. The study design has been previously described in detail.30 Briefly, the investigators implemented a randomized 2x2 design to address the effectiveness of different education strategies involving the health provider and people with diabetes).

Sample size: for its determination in each of the four groups, the investigators considered the change in haemoglobin A1c (from baseline to the end of the study) as the primary outcome variable. This was done using a two-sided test at the 5% level of significance and 80% power using a paired t-test. The sample size was increased by 25% to account for non-independence and dropout, resulting in the number of providers and patients listed in table 1.

Educational strategies The investigators used the Diabetes Training Course for Physicians and Diabetes Structured Education Courses for People with T2DM, whose characteristics and usefulness have been previously reported.

Data collection Patients' clinical, psychological, biochemical, therapeutic and economic data before and after PRODIACOR were recorded using the Physician Data Form, the Annual and Bi-annual Clinical Record Form and the Feedback Report Form. The investigators developed software that compares the first two mentioned forms and generates a Biannual Feedback Report for physicians and patients; it compares the values recorded for haemoglobin A1c, serum lipids and blood pressure, and the goal proposed for each parameter according to international standards. It also includes recommendations about appropriate treatment to achieve therapeutic goals.31 Additionally, the investigators used the Patient Questionnaire, based on the one previously used in the Diabetes Advantage Program (DAP) which includes questions about the disease, and the WHO-5 well-being questionnaire. Data collection was completed with the Personalized Checkbook, a tool initially developed for the PROPAT study, whose aim and content have been previously described. It serves to order procedures, consultations, laboratory tests, prescription of drugs and strips for glucose self-monitoring, to record and communicate results, and as a payment voucher for all those items.

Study and Data management The Local Coordinator (city of Corrientes) together with the Central Cordinating Center (CENEXA), oversaw the education courses and the overall trial and maintained periodic contact with the participating physicians. Performance of the physicians and their patients was monitored at regular intervals (6 months) during the whole study period. Every physician was visited twice a year by a physician monitor who assessed the quality of the data he has recorded.30 Participating physicians collect their own patients´ data, sent it to the Local Coordinator who controlled its completeness and forwarded to the Central Coordinating Centre.

Resource utilization and costs The data recorded include all direct medical items used by each of the patients ascribed to the programme, and were obtained from the checkbook and the utilization and cost records from each of the participating health coverage entities.

Utilization was classified into five groups: i) hospitalizations, ii) drugs and supplies, iii) diagnostic tests, iv) special studies, and v) physician office visits. Drugs were identified by their generic and commercial name and their corresponding presentation. Their costs were assessed from retail prices published by Alfabeta.net and adjusted to July 2004 using the health chapter of local Consumer Price Index.

Estimated drug costs and haemoglobin A1c reduction experienced by each treatment group were used to construct marginal figures of cost-consequence ratio. For this purpose, the investigators calculated such ratio figures for each experimental group, i.e., the investigators expressed the total drug cost associated to 1% haemoglobin A1c decrease to 10 mm Hg of systolic blood pressure or 10 mg/dL of triglyceride levels. The investigators did not currently estimate the costs of the educational interventions themselves, namely, all the physical and human resources involved in the management and administrative activities of the programme.

Statistical analysis To estimate the effects of the different educational interventions tested, intention to treat analysis was used. Initial univariate differences among groups for quantitative data were analyzed by one-way ANOVA (Bonferroni post hoc test). Factorial ANOVA and two-way ANOVA models (Bonferroni post hoc test) were used to assess the differences among groups along the study. ANOVA was also used to explore initial vs. end-of-study differences among quantitative data. Differences among qualitative measures were explored by Chi-squared (Yates corrected). P values of less than 0.05 were considered as significant (two tailed). Missing data strategies applied to the primary endpoint were last observation carried forward and complete case analysis. Both strategies were compared to evaluate the impact of missing data on the efficacy analysis of the primary endpoint.

Study Type

Interventional

Enrollment (Actual)

468

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Argentina
    • Buenos Aires
      • La Plata, Buenos Aires, Argentina, 1900
        • CENEXA (UNLP-CONICET La PLata)

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 75 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Adults Patients with type 2 diabetes
  • Being regularly attended at the doctors office during at least one year

Exclusion Criteria:

  • Newly diagnosed type 2 diabetes
  • Advanced stage of chronics complications (End-stage-kidney disease)
  • Heart Failure.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Allocation: Randomized
  • Interventional Model: Factorial Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
No Intervention: Patients and provider non educated
In this arm neither the patients nor the providers have attended the groupal education courses
Other: Education
Structured group education programmes were delivered to provider and/or people with type 2 diabetes by trained professionals; identical system interventions were applied to all four groups.
Other Names:
  • Diabetes Education
Active Comparator: Provider educated
Provider attend the interactive group education, while patients do not.
Other: Education
Structured group education programmes were delivered to provider and/or people with type 2 diabetes by trained professionals; identical system interventions were applied to all four groups.
Other Names:
  • Diabetes Education
Active Comparator: Patients Educated
Patients attend the interactive group education, while providers do not.
Other: Education
Structured group education programmes were delivered to provider and/or people with type 2 diabetes by trained professionals; identical system interventions were applied to all four groups.
Other Names:
  • Diabetes Education
Active Comparator: Providers/Patients Educated
Provider and Patients both attend the interactive group education.
Other: Education
Structured group education programmes were delivered to provider and/or people with type 2 diabetes by trained professionals; identical system interventions were applied to all four groups.
Other Names:
  • Diabetes Education

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
HbA1c
Time Frame: 42 months
42 months

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Quality of Care Indicators
Time Frame: 42 months
Body mass index, blood pressure, fasting glucose, lipid profile, drug consumption, resource use, and patient well being (WHO-5 questionnaire and Lowe score)
42 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Centro de Endocrinologia Experimental y Aplicada

Collaborators

National Council of Scientific and Technical Research, Argentina

Investigators

  • Study Director: Juan J Gagliardino, MD, CENEXA (UNLP-CONICET La PLata)

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

December 1, 2006

Primary Completion (Actual)

March 1, 2007

Study Completion (Actual)

July 1, 2010

Study Registration Dates

First Submitted

October 19, 2011

First Submitted That Met QC Criteria

October 20, 2011

First Posted (Estimate)

October 21, 2011

Study Record Updates

Last Update Posted (Estimate)

October 21, 2011

Last Update Submitted That Met QC Criteria

October 20, 2011

Last Verified

October 1, 2011

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 1374/2006 (ACC)

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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