Table 6. Combination of clinical symptoms and signs in 800 patients with pulmonary embolism (Pisa versus Firenze).

	Pisa (N = 440)		Firenze (N = 360)
	n	(%)	n	(%)	P-Value*
Only one of four symptoms†	166	(38)	171	(47)	0.006
Any two of four symptoms†	204	(46)	125	(35)	<0.001
Any three of four symptoms†	58	(13)	32	(9)	0.057
At least one of four symptoms†	428	(97)	328	(91)	<0.001
Other symptoms‡	8	(2)	7	(2)	1.000
Symptoms and signs of DVT only	1	(0.3)	21	(6)	<0.001
No symptoms at all	3	(0.7)	4	(1)	0.707

DVT = deep vein thrombosis.

^*Pisa versus Firenze.

^†Sudden onset dyspnea, chest pain, fainting or syncope, and hemoptysis. These symptoms are not explained otherwise.

^‡Gradual onset dyspnea (n = 10); palpitations (n = 5).