Table 1

Pretest probability, SimpliRED, blood gas tension, and respiratory rate findings in 517 cases referred for a lung scan for suspected acute pulmonary embolism

Observation madeProportion
of cases1-150
High pretest probability216/51542
SimpliRED negative249/49950
Pao2 ⩾80 mm Hg160/47134
Respiratory rate ⩽20/minute308/50961
  • 1-150 The denominator represents the number of cases in which observations were available.