Table 1 Patient characteristics in the derivation and validation set
|  | Derivation set (n = 2555) | Validation set (n = 685) | P Value |
|---|---|---|---|
Age, years, No. (%) | 68 (61—77) | 68 (60—77) | 0.58 |
Sex, male, No. (%) | 1182 (46.3%) | 312 (45.5%) | 0.77 |
PE severity grade, No. (%) | |||
 Severe | 353 (13.8%) | 88 (12.8%) | 0.79 |
 Moderate | 140 (5.5%) | 38 (5.5%) | |
 Mild | 93 (3.6%) | 21 (3.1%) | |
 No PE | 1969 (77.1%) | 538 (78.5%) | |
Symptoms, No. (%) | |||
 Anhelation | 671 (26.3%) | 186 (27.2%) | 0.67 |
 Lower limb edema | 81 (3.2%) | 31 (4.5%) | 0.11 |
 Chest distress | 840 (32.9%) | 214 (31.2%) | 0.44 |
 Chest pain | 764 (29.9%) | 210 (30.7%) | 0.74 |
 Hemoptysis | 35 (1.4%) | 9 (1.3%) |  > 0.99 |
 Syncope | 188 (7.4%) | 53 (7.7%) | 0.80 |
 Cough | 60 (2.3%) | 20 (2.9%) | 0.47 |
 Palpitation | 248 (9.7%) | 68 (9.9%) | 0.92 |
Signs, median (IQR) | |||
 Temperature, ℃ | 36.5 (36.2—36.8) | 36.5 (36.2—36.7) | 0.30 |
 Heart rate, beats/min | 88 (77—103) | 88 (76—102) | 0.91 |
 Systolic blood pressure, mmHg | 140 (122—158) | 139 (120—156) | 0.82 |
 Diastolic blood pressure, mmHg | 76 (66—86) | 76 (67—86) | 0.70 |
 Oxygen saturation, % | 96 (94—98) | 96 (94—98) | 0.67 |
Past medical history, No. (%) | |||
 Cancer | 86 (3.4%) | 32 (4.7%) | 0.13 |
 Pulmonary embolism | 61 (2.4%) | 21 (3.1%) | 0.39 |
 Immobilization | 584 (22.9%) | 144 (21.0%) | 0.33 |
 Hypertension | 423 (16.6%) | 102 (14.9%) | 0.15 |