1167 / 1983
De Ruysscher JCO 2010
Level of
recommendation
Quality of evidence
A (high)
B (moderate)
C (low)
1 (strong)
applies for most patients,
in most circumstances
without reservation
may change with
new evidence
2 (weak)
best action depends on
patients, circumstances,
and societal values
other alternatives
may be equally
reasonable