Clinical features

• smoking ^a
• hypertension ^a
• obesity (BMI > 29) ^a

Why?

• These are all increase the risk of having a pulmonary embolism ^a

Obesity, heavy smoking and hypertension increase the risk of having a pulmonary embolism

Patient	Prognostic Factor	Outcome	CER	RR (95% CI)	NNF+ (95% CI)
healthy a	BMI >29.0 independent	pulmonary embolism at 16 years	0.22%	3.0 (2.0 to 4.7)	150 (100 to 270)
	25-34 cigarettes /day independent		0.26%	1.8 (1.2 to 2.9)	210 (130 to 320)
	35 or more cigarettes /day independent		0.26%	2.1 (1.2 to 3.6)	180 (110 to 320)
	hypertension independent		0.23%	1.5 (1.2 to 2.0)	290 (220 to 370)