1834-1835 / 2001
•
Why such differences ? tentative
explanations:
•
1/ Differences in follow-up ?
the longer the follow-
up, the lower the BFS ?
•
Battermann and Grado , publishing at 73 and 64 months,
report the lowest BFS ; 23 and 34 % , respectively.
•
But Beyer, with a 62 months follow-up, reports a BFS of
53 %,
•
And Burri, with a follow-up of 86 months, reports an
equivalent BFS of 54 %
•
Therefore, the variations in follow-up durations
do not explain all the differences …