Table 1.

CKD diet score system to estimate adherence to CKD-specific dietary recommendations applied in the German Chronic Kidney Disease (GCKD) observational cohort study (2012–2014).

Component	1 Point	2 Points	3 Points	4 Points	5 Points
Sodium/1000 kcal	>1.22 g	1.1–1.22 g	1.0–1.09 g	0.88–0.99 g	<0.88 g
Potassium/1000 kcal	<1.13 g	1.13–1.24 g	1.25–1.36 g	1.37–1.52 g	>1.53 g
Fiber/1000 kcal	<7.42 g	7.42–8.59 g	8.60–9.73 g	9.74–11.1 g	>11.1 g
Total protein/1000 kcal	>39.82 g	36.08–39.82 g	33.14–36.07 g	30.04–33.13 g	<30.04 g
Sugar/1000 kcal	>64.91 g	53.67–64.90 g	44.85–53.66 g	36.11–44.84 g	<36.11 g
Cholesterol/1000 kcal	>183.9 mg	164.73–183.9 mg	147.62–164.72 mg	127.95–147.61 mg	<127.95 mg

Dietary intake of each component was split into quintiles to score the adherence to the dietary components. Values describe range of dietary amount per 1000 kcal to achieve the respective score. The scores of each component were added to calculate the overall CKD diet score = sodium score × 1.5 + potassium score + fiber score + protein score × 1.5 + sugar score + cholesterol score. As dietary advice in CKD focuses mainly on restricting intake of dietary sodium and protein, points for sodium and protein were multiplied by 1.5 to increase weight of these components for the calculation of the CKD diet score. Thus, CKD diet score ranged from 7 points (poorest adherence to CKD-specific dietary recommendations) to 35 points (highest adherence to CKD-specific dietary recommendation).