(Rose) Assistant Professor, Department of Anaesthesia, University of Toronto.
(Cohen) Associate Professor, Departments of Anaesthesia and Health Administration, University of Toronto; Senior Scientist, Clinical Epidemiology Unit, Sunnybrook Health Science Centre, Toronto.
(DeBoer) Biostatistician, Clinical Epidemiology Unit, Sunnybrook Health Science Centre, Toronto.
Received from the Department of Anaesthesia, St. Michael's Hospital, and the Department of Anaesthesia, University of Toronto, Toronto, Canada. Submitted for publication February 28, 1995. Accepted for publication December 2, 1995. Supported by the Physicians Services Inc Foundation and a Health Canada, National Health Scholar Award (M.M.C.). Presented in part at the European Congress of Anesthesiology, Jerusalem, Israel, October 2-7, 1994, and at the annual meeting of the Canadian Anaesthetists' Society, Edmonton, Alberta, Canada, June 17-21, 1994.
Address reprint requests to Dr. Rose: Department of Anaesthesia, St. Michael's Hospital, 30 Bond Street, Toronto, Ontario, Canada M5B 1W8.