1. Prescribed versus calculated differences in protein intake in studies comparing low with normal or free protein diets.

Study	Difference in prescribed protein intake	Difference in actual protein intake	Difference between prescribed and actual protein intake
Anonymous Study 1 1990	0.4 g/kg/d	0.12 g/kg/d	0.28 g/kg/d
Bergstrom 1986	0.45 g/kg/d	0.21 g/kg/d	0.24 g/kg/d
Cianciaruso 2008a	0.25 g/kg/d	0.17 g/kg/d	0.08 g/kg/d
Chauveau 1986	0.2 g/kg/d	0.2 g/kg/d	0 g/kg/d
Locatelli 1989	0.4 g/kg/d	0.18 g/kg/d	0.22 g/kg/d
MDRD Feasibility Study A 1989	0.625 g/kg/d	0.19 g/kg/d	0.435 g/kg/d
MDRD Study 1 1989	0.72 g/kg/d	0.4 g/kg/d	0.32 g/kg/d
Meloni 2004	0.4 g/kg/d	0.87 g/kg/d	0.47 g/kg/d
Williams 1991	0.4 g/kg/d	0.45 g/kg/d	0.05 g/kg/d