Clinical features

• if they have a primary care physician ^b
• if they take their antihypertensive medication ^b

Why

Patients with no primary care physician or who fail to take medication are at increased risk of severe hypertension

Outcome	Risk Factor	Peer	OR (95% CI)	NNH (95% CI)
severe hypertension and Grade III or IV hypertensive retinopathy b	no primary care physician not independent	2%	3.5 (1.6 to 7.7)	15 (6 to 58)
	non-complicance with antihypertensive regimen not independent		1.9 (1.4 to 2.5)	39 (24 to 87)