Table 1. Baseline characteristics.

	All patients ( n  = 1,473)
Mean age, y (SD)	54.4 (18.6)
Female sex, n (%)	922 (62.6)
Pulmonary embolism, n (%)	214 (14.5)
CTPA indicated following YEARS, n (%)	763 (51.8)
Prior VTE, n (%)	146 (9.9)
COPD, n (%)	208 (14.1)
Heart failure, n (%)	30 (2.0)
Malignancy, n (%)	133 (9.0)
Immobilization or recent surgery, n (%)	159 (10.8)
Use of estrogen in women, n (%)	131 (14.2)
Smoking, n (%)	250 (23.8)
Symptoms, n (%)
Dyspnea	1,045 (70.9)
Coughing	579 (39.3)
Thoracic pain	1,086 (73.7)
Palpitations	115 (7.8)
Fever (>38.5°C)	47 (3.2)

Abbreviations: COPD, chronic obstructive pulmonary disease; CTPA, computed tomography pulmonary angiography; VTE, venous thromboembolism.