The survey of 1,022 Michigan adults by the Center for Healthcare Research & Transformation showed while 40 percent of those who lacked insurance delayed seeking needed care, so did 17 percent of those with health insurance -- mostly due to cost concerns.
Seventy-two percent of those with incomes of $150,000 or more reported excellent or good health, compared to 14 percent of those with incomes of less than $10,000 per year. However, 49 percent of those who were insured reported excellent or very good health, compared to 47 percent of the uninsured.
The survey says many low-income urban dwellers had fewer problems accessing care than all but high-income suburban dwellers -- potentially reflecting the greater availability of healthcare "safety net" providers in urban areas. Residents in rural communities and small towns reported more problems with access to care.
"Rather than a simple count of who has health insurance and who doesn't, we wanted to get a clearer picture of the people behind the statistics," Marianne Udow-Philips, director of the Center for Healthcare Transformation and Research, says in a statement.
The survey was conducted in last August and has a margin of error of 3.1 percentage points.