CCL: Bond ditance accuracy using B3LYP method

 Sent to CCL by: "Vera  Cathrine" [vera.cathrine(!)]
 Dear All,
 I have obtained a bond distance for O-H in a molecular system using ONIOM
 (QM/MM) method inside G09. This O-H bond is inside my QM region. My QM level of
 calculation is B3LYP/6-31+G**. I like to how much is the accuracy of this method
 in estimation of bond length? How much is average error or uncertainty for bond
 distance in such calculation compared with Xray crystal structure, neutron
 diffraction or other experimental techniques?
 Any reference is also greatly appreciated.
 Best wishes,