Clinical Practice Intensity: Comparing Veterans Affairs (VA) to Private Sector Physicians

Study Overview
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Brief Summary
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This is a national physician mail survey examining primary care practice patterns. The experimental component of the study (the clinical trial) is a randomized trial of different monetary incentive forms and amounts for physicians invited to participate in the study. Only non-VA physicians will be included in this part of the study. (VA physicians are not allowed to receive monetary incentives.) Physicians will be randomized to receive one of four incentives. The main outcome measure is the response rate.

Detailed Description
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This primary care physician survey is being conducted by Harris Interactive, an international survey research firm working collaboratively under contract to VA investigators heading the study. Surveys will be mailed to a random sample of 1000 non-VA primary care general internists practicing 20 or more clinical hours per week, identified via the Physician Masterfile of the American Medical Association. The initial survey mailing, delivered via USPS Priority Mail, will include a cover letter inviting the physician to participate, a 12-page survey booklet (including a cover page, a 9-page survey, and 2 blank pages), a monetary incentive, and a prepaid addressed return envelope. The survey is estimated to take 20 minutes to complete. All survey recipients will also have the opportunity, as part of the survey, to request information about practice patterns in their community. Harris Interactive will randomly assign all invited (non-VA) physicians to receive one of four incentives, included in the initial survey mailing. Non-responders will be contacted two additional times (at approximately 2 and 4 weeks following the initial mailing) by telephone and by mail. Subsequent mailings will include the survey, a cover letter, and a stamped addressed return envelope, but no monetary incentive. Response rates will be compared between the four arms of the trial; between check v. cash; and between different denominations.

Official Title
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Clinical Practice Intensity: Comparing VA to Private Sector Providers

Conditions
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Physician Survey Response Rates

Intervention / Treatment
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* Other: $20 cash
* Other: $50 cash
* Other: $50 check
* Other: $100 check


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Primary care general internists in the United States, identified through the AMA Physician Masterfile, who practice at least 20 hours per week are eligible to participate. All physicians included in the sample to whom the survey packets are mailed will be included in the analysis of the incentive experiment, except those for whom a survey packet is returned as undeliverable and those non-respondents identified through follow-up procedures as non-locatable, deceased, or retired. Exclusion Criteria: - Physicians self-identified in the AMA Masterfile as medical subspecialists or hospitalists are excluded from the sample.
Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Health Services Research
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: $20 Cash<br> | Other: $20 cash<br>* $20 cash incentive mailed with survey<br>|
| Experimental: $50 Cash<br> | Other: $50 cash<br>* $50 cash incentive mailed with survey<br>|
| Experimental: $50 Check<br> | Other: $50 check<br>* $50 check incentive mailed with survey<br>|
| Experimental: $100 Check<br> | Other: $100 check<br>* $100 check incentive mailed with survey<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Survey response rate |  | 2 weeks, 2 months (primary), and 6 months after initial mailing | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Item non-response rates |  | 2 weeks, 2 months (primary), and 6 months after initial mailing | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Physician survey, Mail survey, Response rate