 Though no precise data on the undocumented immigrant population is available, estimates in 2009 suggest that 70% are from either Mexico or Central America.A study conducted by Pew Hispanic Center in 2007 indicated that factors that determined quality of care included years of residency in the United States, income level, education status, health insurance coverage, and health literacy.Among many immigrant groups, Latino communities tend to undergo challenges in healthcare settings and receive lower quality of care than other ethnic groups.