NFB type (batteries and magnets) |
OR= 6.5, P=0.01 |
All other
NFB together |
More than one removal attempt |
OR= 6.4, P=0.01 |
Removal in
the first attempt |
Posterior insertion of NFB |
OR= 2.4, P=0.02 |
Anterior
insertion |
Left-side insertion of NFB |
OR= 1.8, P=0.02 |
Right-side
insertion |