Physician supply in Ontario: further observations on SHARP and the SHARP projections.

In this issue (see pages 1395 to 1398) Eva Ryten questions the validity of the data that supported the projection of a surplus of physicians in Ontario over the next two decades, as presented in an earlier article in CMAJ by Denton, Gafni and Spencer. The authors maintain that the data they used were appropriate. Although the average annual growth rate for the early 1990s calculated from Ontario Health Insurance Plan (OHIP) billing data is …