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) |