2019 OMAS Survey

The 2019 OMAS is a critical tool for assessing health care access, health status, health care use, and select behavioral risks for the State of Ohio, emphasizing current and potential eligible Medicaid participants. The 2019 OMAS is the 8th iteration of the series which builds upon prior OMAS surveys to identify trend changes for Ohio's Medicaid, Medicaid-eligible, and non-Medicaid populations. With a sample size of almost 32,000 adult interviews, the 2019 survey is representative of all residential non-institutional Ohioans and includes data for approximately 7,400 child interviews, collected from proxy adults.

The 2019 OMAS is a MEDTAPP funded project sponsored by the Ohio Department of Medicaid and The Ohio State University. The survey vendor is RTI International, a non-profit organization that provides research and technical services.

Survey Data

The 2019 OMAS public use dataset and associated documentation are available for download at https://grc.osu.edu/OMAS. This public use dataset contains all the data collected from the adult and child questionnaires except for select geographic identifiers (zip codes). Researchers interested in obtaining a dataset with geographic identifiers should submit a data-use inquiry to learn more about the process for acquiring the restricted access research dataset.

2019 Public Use File

Please note that the 2019 Public Use Files were updated in November 2022 to address updates to the way that derived race-ethnicity variables were coded and how health insurance variables were imputed to better align with updates that were made as part of the 2021 OMAS data. Survey weights were also updated as part of the revision. If you utilized the earlier version of the file, your estimates may be slightly different, and we encourage you to re-download the file for analysis.

• Stata
• R
• SAS
• SPSS

2019 County-Level Small Area Estimation Maps & Tables

• SAE Maps & Tables

To increase the precision of key 2019 outcomes from OMAS at the county level, a small area
estimation (SAE) methodology was implemented, individually incorporating each of the
specified outcomes in a statistical model by “borrowing strength” from other counties and
auxiliary information.

2019 OMAS Questionnaire

• 2019 Survey Instrument

2019 OMAS Analytical Codebook Files

• Adult Codebook
• Child Codebook
• Derived Codebook
• Adult Contents
• Child Contents
• Derived Contents

Design and Methods

The 2019 OMAS was structured as a stratified random digit dial (RDD) dual-frame (cell phone and landline phone) complex designed (multiple strata) telephone survey that enables analyses at the state, Medicaid Managed Care Plan region, and select county levels. Survey weighting was performed in stages at the county, regional, state, oversample, and cell phone levels to provide robust analyses with inferential certainty. The sample excluded institutional settings such as university dorms, incarceration facilities, assisted living facilities, hospitals, and businesses. The selection method ensured a reliable sample of residents.

An additional address-based sampling (ABS) pilot was conducted within a limited number of Ohio counties to complement the RDD frame and determine the impact of using mail-to-web and paper response modes for potential OMAS iterations. Select counties were examined to understand county level differences between modes on estimates. Drop points with more than four units, non-OWGM PO Boxes, and businesses were excluded, however unlike the RDD frame, dormitories were included in the ABS frame. Over 1,500 interviews were completed via mail-to-web and paper response modes.

2019 Methodology Report

• 2019 Methodology Report

Research and Reports

Below is a list of briefs, chartbooks, and presentations that address key findings from the 2019 OMAS. Please continue to check back regularly as we post these findings.