Table 3.

Grading of quality of evidence

KDIGO grade	GRADE grade
for quality of	for quality of
evidence	evidence	Meaning
A	High	We are confident that the true effect lies close to our estimate of the effect
B	Moderate	The true effect is likely to be close to our estimate of the effect, but there is a possibility that it is substantially different
C	Low	The true effect may be substantially different from our estimate of the effect
D	Very low	Our estimate of the effect is just a guess, and it is very likely that the true effect is substantially different from our estimate of the effect