Table 2. ED attendances, admits, yield; CTPA usage and PE diagnosis per 1000 ED adults.
| Site | Adult ED patients during study | ED Admits study (%)* | CTPA (n) per site | YIELD—% +ve for PE | CTPA/1000 ED adults | CTPA/ 1000 ED admits | CTPA +ve for PE /1000 ED adults$ |
|---|---|---|---|---|---|---|---|
| A | 67601 | 9379 (13.9%) | 520 | 15.8 | 7.7 | 55.4 | 1.2 |
| B | 50120 | 28100 (36.4%) | 499 | 13.4 | 10.0 | 17.8 | 1.3 |
| C | 109942 | 54963 (35.2%) | 500 | 15.8 | 4.6 | 9.1 | 0.7 |
| D | 84800 | 44000 (33%) | 515 | 9.3 | 6.1 | 11.7 | 0.6 |
| E | 83300 | 47800 (54.5%) | 509 | 16.7 | 6.1 | 10.6 | 1.0 |
| F* | 232000 | 71100 (22.8%) | 443 | 25.3 | 1.9 | 6.2 | 0.5 |
| G | 44795 | 20830 (46.7%) | 499 | 17.0 | 11.1 | 24.0 | 1.9 |
| H | 70209 | 23450 (33.2%) | 362 | 10.2 | 5.2 | 15.4 | 0.5 |
| I | 37643 | 20686 (40.9%) | 324 | 16.0 | 8.6 | 15.7 | 1.4 |
| J | 80326 | 37392 (46.5%) | 491 | 12.4 | 6.1 | 13.1 | 0.8 |
| K | 129000 | 74300 (58%) | 1056 | 16.2 | 8.2 | 14.2 | 1.3 |
| L | 33897 | 17200(38.1%) | 500 | 9.8 | 14.7 | 29.1 | 1.4 |
| M | 38656 | 13575 (26.1%) | 421 | 12.8 | 10.9 | 31.0 | 1.4 |
| N | 60793 | 21018 (29.3%) | 436 | 11.7 | 7.2 | 20.7 | 0.8 |
| Totals OR Means* (CI) |
1123082 | 483793 | 7075 | 14.6* (13.8–15.4%) |
6.3* | 14.6* | 0.9*$ |
$ NB that some sites (12/14) also use VQ for a small proportion of their patients in the assessment for possible PE so that the rate of PE/1000 will be an under-estimation of total population diagnoses