Table 1.
Characteristics of the patients in the “PE likely” and “PE unlikely” group
| Characteristics | “PE unlikely” (total n = 200) | “PE likely” (total n = 153) | χ2 (P value) | ||||
|---|---|---|---|---|---|---|---|
| n | (%) | n | (%) | ||||
| Age group (years) | 18–30 | 43 | (21.5) | 34 | (22.2) | 3.417 | (0.332) |
| 31–50 | 83 | (41.5) | 71 | (46.4) | |||
| 51–70 | 47 | (23.5) | 24 | (15.7) | |||
| > 70 | 27 | (13.5) | 24 | (15.7) | |||
| Gender | Male | 75 | (37.5) | 50 | (32.7) | 0.881 | (0.348) |
| Female | 125 | (62.5) | 103 | (67.3) | |||
| D-dimer assay order | Ordered | 86 | (43.0) | 63 | (41.2) | 0.118 | (0.731) |
| Not ordered | 114 | (57.0) | 90 | (58.8) | |||
| D-dimer level (mg/dL) | ≤ 0.5 | 5 | (5.8) | 1 | (1.6) | 1.681 | (0.195) |
| > 0.5 | 81 | (94.2) | 62 | (98.4) | |||
| CT-PA result | Negative | 163 | (81.5) | 124 | (81.0) | 0.012 | (0.914) |
| Positive | 37 | (18.5) | 29 | (19.0) | |||
n number of patients, CT-PA computed tomography pulmonary angiography