Table 3. Univariate Analysis Using Cox Proportional Hazards Regression Model.
| Characteristics | CTPA Group | DECT Group | ||||
|---|---|---|---|---|---|---|
| HR | 95% CI | P | HR | 95% CI | P | |
| Age | 1.009 | 0.987–1.032 | 0.417 | 1.024 | 0.998–1.049 | 0.065 |
| Sex (female) | 1.317 | 0.670–2.590 | 0.424 | 0.672 | 0.374–1.207 | 0.283 |
| Hypertension | 1.442 | 0.738–2.817 | 0.283 | 1.616 | 0.890–2.934 | 0.115 |
| Diabetes mellitus | 1.277 | 0.598–2.726 | 0.526 | 1.289 | 0.666–2.496 | 0.451 |
| Smoking* | 0.992 | 0.451–2.183 | 0.983 | 1.180 | 0.598–2.330 | 0.632 |
| Heart disease† | 1.387 | 0.425–4.531 | 0.587 | 1.256 | 0.450–3.510 | 0.663 |
| COPD | 2.082 | 0.807–5.366 | 0.129 | 2.177 | 0.921–5.144 | 0.076 |
| Pneumonia | 2.554 | 1.196–5.451 | 0.015 | 3.949 | 2.120–7.357 | < 0.001 |
| Cancer | 3.329 | 1.512–7.329 | 0.002 | 3.413 | 1.689–6.895 | < 0.001 |
| DVT | 0.502 | 0.177–1.423 | 0.195 | 0.260 | 0.081–0.840 | 0.024 |
| Anticoagulants | 1.787 | 0.774–4.072 | 0.278 | 2.104 | 0.813–5.062 | 0.181 |
| Thrombolytic treatment | 0.518 | 0.321–0.947 | 0.186 | 0.584 | 0.238–1.142 | 0.238 |
| Inferior vena cava filter | 2.031 | 0.781–9.712 | 0.142 | 2.579 | 0.744–10.164 | 0.115 |
| VD ratio (≥ 1) | 3.407 | 1.596–7.270 | 0.001 | 7.471 | 3.593–15.534 | < 0.001 |
| RelPD% | - | - | - | 1.065 | 1.013–1.120 | 0.012 |
*Current or former smoker, †Heart disease includes congenital heart disease, coronary artery disease, myocardial infarction, valvular heart disease, heart failure, arrhythmia and cardiomyopathy. Dash (−) indicates no patient. CI = confidence interval, HR = hazard ratio, RelPD% = relative perfusion defect volume, VD = ventricular diameter