Fig. 3

Nomogram for the prediction of the probability (prob.) of hypertension at 12 months after laparoscopic adjustable gastric banding (LAGB), based on plasma renin activity (PRA) and fasting blood glucose (FPG). For each patient variable (PRA and FPG), a vertical line is drawn from the value on the bar for that variable to the upper scale of points (dotted red lines show that PRA = 5 corresponds to 14 points in the upper bar and FPG = 250 corresponds to 24 points). The sum of these two points is then located on the scale indicating the “Total Points” (here: 14 + 24 = 38 total points), and a vertical line is drawn downwards (green dotted line). Where this line intersects, the scale for 12 m hypertension probability gives the percentage risk of hypertension at 12 months after LAGB. Values outside the indicated bar should be read as risk < 10% (for Total Points < 5) or risk > 95% (for Total Points > 42), respectively. In the example above, a subject with PRA of 5 and FPG of 250 has about 90% risk of hypertension at 12 months despite weight loss