Figure 4From: BELFAST nonagenarians: nature or nurture? Immunological, cardiovascular and genetic factorsTertiles of Systolic and Diastolic Blood Pressure in relation to Serum Sodium in BELFAST study. Systolic Blood Pressure. Tertile 1 < 120 mmHg. Tertile 2 120-140 mmHg. Tertile 3 > 140 mmHg.Back to article page