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Updated: Jul 4, 2026

Inverse Probability of Treatment Weighting (Propensity Score) using the Military Health System Data Repository and National Death Index
Published on: January 8, 2020
Randomized trial showed requesting medical records with a survey produced a more representative sample than
Melissa R Partin1, Diana J Burgess, Krysten Halek
1Center for Chronic Disease Outcomes Research, Minneapolis VA Medical Center (2E/152), 1 Veterans Drive, Minneapolis, MN 55417, USA. melissa.partin@va.gov
Including a medical records request with a colorectal cancer screening survey did not lower response rates or self-reported screening quality. This method yielded more complete and representative patient records.
Area of Science:
- Health Services Research
- Medical Record Management
- Cancer Screening
Background:
- Accurate medical records are crucial for research validity.
- Optimizing methods for obtaining patient records is essential for study success.
Purpose of the Study:
- To compare two methods of requesting medical records: integrated with a survey versus a separate mailing.
- To evaluate the impact of these methods on survey response rates, sample representativeness, and self-reported screening quality.
Main Methods:
- 890 veterans (aged 50-75) from Minneapolis VA Medical Center were randomized.
- Groups: 1) Records request with colorectal cancer screening survey, 2) Records request mailed after survey completion.
- Analyses focused on response rates, record provision proportion/characteristics, and self-reported screening validity.
Main Results:
- Response rates were similar between groups (76% vs. 78%, P=0.45).
- A higher proportion of the 'with-survey' group provided complete medical records (54% vs. 47%, P=0.06).
- Self-reported screening validity did not differ significantly between groups.
Conclusions:
- Integrating medical record requests with surveys is effective.
- This approach does not negatively impact response rates or data quality.
- It yields a more representative sample with complete medical records.
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