“…While most conclude that there is no association between income and incidence of GP utilization when assessed over a 1-year period (Broyles et al 1983;Birch, Eyles, and Newbold 1993;McIsaac, Goel, and Naylor 1997;Dunlop, Coyte, and McIsaac 2000;Finkelstein 2001), the association between income and volume of GP utilization is less clear. Several studies have reported an inverse association even after adjustment for need (Broyles et al 1983;McIsaac, Goel, and Naylor 1997;Dunlop, Coyte, and McIsaac 2000), while others have reported no differential utilization by income level (Birch, Eyles, and Newbold 1993;Finkelstein 2001). In general, most studies that were unable to use direct measures to control for medical need found an expected inverse association between income and utilization of GP services Kephart, Thomas, and MacLean 1998;Veugelers and Yip 2003); however, a recent study by Roos et al (2004) observed lower than expected use of physician services among individuals from poorer neighborhoods.…”