Table 2 Clinical and demographic characteristics of those patients who underwent a CTPA during the study period
|  | Overall (N = 2811) | PE positive (N = 292) | PE negative (N = 2519) |
|---|---|---|---|
Age (mean, SD) | 59.7 (17.3) | 60.2 (15.5) | 59.7 (17.5) |
Gender (N, %) | |||
 M | 1112 (39.6%) | 152 (52.1%) | 960 (38.1%) |
 F | 1699 (60.4%) | 140 (47.9%) | 1559 (61.9%) |
CTAS scorea | |||
 1 | 45 (1.6%) | 7 (2.4%) | 38 (1.5%) |
 2 | 1855 (66.1%) | 205 (70.5%) | 1650 (65.6%) |
 3 | 888 (31.7%) | 78 (26.8%) | 810 (32.2%) |
 4,5 | 18 (0.6%) | 1 (0.3%) | 17 (0.7%) |
 Not available | 5 | 1 | 4 |
Chief Complaint | |||
 chest pain | 968 | 83 | 886 |
 shortness of breath | 786 | 81 | 705 |
 syncope/presyncope | 105 | 13 | 92 |
 other | 947 | 114 | 832 |
 Not available | 5 | 1 | 4 |