equity-enhancing effect of primary care resources (primary care to population ratios) is
shown in a study that examined postneonatal mortality rates in the 50 US states. Socially
deprived states (those with high income inequality) had a 17% decrease (from average
rates) if they were well endowed with primary care physicians, but a 7% increase in
postneonatal mortality if they were relatively deprived of primary care physicians. States
with relatively even distribution of income had a small positive effect of relatively high
primary care physician to population ratio and a small negative effect (increased
mortality) if primary care resources were relatively low.
Based on data in: Shi L, Starfield B. Primary care, income
inequality, and self-rated health in the United States: a mixed-level analysis. Int J
Health Serv 2000; 30(3):541-555.