Related Experiment Video
Updated: Jun 3, 2026

Diagonal Method to Measure Synergy Among Any Number of Drugs
Published on: June 21, 2018
The case for synergy between a usual source of care and health insurance coverage
Jennifer E DeVoe1, Carrie J Tillotson, Sarah E Lesko
1Department of Family Medicine, Oregon Health & Science University, 3181 Sam Jackson Park Rd, Portland, OR 97239, USA. devoej@ohsu.edu
Background:
In 2010, the United States (US) passed health insurance reforms aimed at expanding coverage to the uninsured. Yet, disparities persist in access to health care services, even among the insured.
Objective:
To examine the separate and combined association between having health insurance and/or a usual source of care (USC) and self-reported receipt of health care services.
Design/Setting:
Two-tailed, chi-square analyses and logistic regression models were used to analyze nationally representative pooled 2002-2007 data from the Medical Expenditure Panel Survey (MEPS).
Participants:
US adults (≥18 years of age) in the MEPS population who had at least one health care visit and who needed any care, tests, or treatment in the past year (n = 62,067).
Main Outcome Measures:
We assessed the likelihood of an adult reporting unmet medical needs; unmet prescription needs; a problem getting care, tests, or treatment; and delayed care based on whether each individual had health insurance, a USC, both, or neither one.
Key Results:
Among adults who reported a doctor visit and a need for services in the past year, having both health insurance and a USC was associated with the lowest percentage of unmet medical needs, problems and delays in getting care while having neither one was associated with the highest unmet medical needs, problems and delays in care. After adjusting for potentially confounding covariates (age, race, ethnicity, employment, geographic residence, education, household income as a percent of federal poverty level, health status, and marital status), compared with insured adults who also had a USC, insured adults without a USC were more likely to have problems getting care, tests or treatment (adjusted relative risk [aRR] 1.27; 95% confidence interval [CI] 1.18-1.37); and also had a higher likelihood of experiencing a delay in urgent care (aRR 1.12; 95% CI 1.05-1.20).
Conclusions:
Amidst ongoing health care reform, these findings suggest the important role that both health insurance coverage and a usual source of care may play in facilitating individuals' access to care.
Related Concept Videos
Methods Of Healthcare Delivery System
Managed Care System:
The managed care system is designed to control the cost while maintaining the quality of care. The patient's care from admission to discharge is planned by the primary care provider or the case manager, also known as the gatekeeper. In a managed care system, the number of care providers is limited...
Integrated Healthcare System
Introduction To Health Care Delivery System
The Institute of Medicine (IOM) advocates for a patient-centered, effective, safe, timely, equitable, and effective healthcare system. The National Priorities...
Methods of Documentation VI: Case Management Model
For example, a patient with a chronic illness...
Nursing Clinical Information System
A Nursing Clinical Information System (NCIS) is a specialized type of healthcare information system tailored to meet the unique needs of nursing practice. It incorporates the principles of nursing informatics to streamline information management and improve the quality of care delivery.
Critical attributes of NCIS include:
Secondary Healthcare System