Skip to main content

Table 4 Characteristics of the study population (all patients accessing the ED with a relevant presenting complaint), effect outcome, and balancing measure

From: Feasibility of a quality improvement project to increase adherence to evidence-based pulmonary embolism diagnosis in the emergency department

  Denominator (for proportions) Before, N (%)* After, N (%)* Percentage difference for outcome (95% CI)
Total no. of patients (n) NA 70,932 10,171 NA
No. of patients per month [median (Q1, Q3)] NA 3073 (3206, 3324) 3038 (3437, 3696) NA
Age, years [median (Q1, Q3)] NA 58 (40, 73) 58 (40, 72) NA
Female, n (%) All patients 38,120 (54%) 5519 (54%) NA
Outcomes
Tested for PE All patients 5094 (7.2) 899 (8.8) 1.6 (− 0.3; 3.4)
Test appropriate Patients tested for PE 3782 (74.2) 740 (82.3) 8.1 (5.0; 11.2)
Imaging use All patients 1903 (2.7) 364 (3.6) 0.9 (− 1.1; 3.4)
Imaging positive yield Patients with imaging 247 (13.0) 38 (10.4) − 2.6 (− 13.1; 8.0)
Imaging not appropriate Patients with imaging 432 (22.7) 22 (9.1) − 13.6 (− 26.3; − 0.9)
Imaging missed Patients with positive D-dimer 665 (35.0) 98 (26.0) − 9.0 (− 18.4; 0.4)
PE prevalence All patients 247 (0.4) 38 (0.4) 0.0 (− 2.0; 2.1)
  Central PE All patients 221 (0.3) 34 (0.3) 0.0 (− 2.0; 2.1)
  Distal PE All patients 26 (0.04) 4 (0.04) 0.0 (− 2.1; 2.1
D-dimer use All patients 4643 (6.6) 862 (8.5) 1.9 (− 0.1; 3.9)
  1. CI confidence interval, Q1 first quartile, Q3 third quartile, PE pulmonary embolism
  2. *Unless otherwise specified