Glossary Sample of convenience: A non-random selection of easily available patients (or things). Statistically, this is generally considered lower-level research and not representative of larger groups. Retrospective review: A method of performing research looking backward in time, usually with a chart review. This method is not as desirable as “prospective” (looking forward in time) studies.
Measuring Trauma Systems Dutton RP, Stansbury LG, Leone S, et al. Trauma mortality in mature trauma systems: Are we doing better? An analysis of trauma mortality patterns, 1997–2008. J Trauma. 2010;69:620–626.