This is a protocol for a Cochrane Review (prognosis). The objectives are as follows:

To determine whether sex (i.e. being a male or a female) is an independent (i.e. autonomous) prognostic factor for predicting mortality in adults with acute symptomatic PE. See Table 1 for a formulation of the review question in population, index prognostic factor, comparator, outcome(s), timing, and setting (PICOTS) format.