A new paper based on the National Outdoor Leadership School's Incident database has been published in the Journal of Wilderness and Environmental Medicine (18, 298-304(2007). It gives a perspective on injury and illness rates at NOLS from 2002-2005.   You can access it at: http://www.nols.edu/resources/research/abstracts.shtml.  The title is Medical Incidents and Evacuations on Wilderness Expeditions.  

In 1984 NOLS created a comprehensive safety database to record incident data; all injuries, illnesses, near-miss incidents, and evacuations that occur on courses.  At 23 years and counting we believe it’s the longest running dataset in the industry, with more than 3 million person days of experience and 13,000 records. These data are used to guide the development of WMI’s curriculum and the wilderness medicine and risk management practices of NOLS.  This is the latest of three peer reviewed journal papers generated from this database.