The statistical approach, although preferred, could not be used for the calculation of the withdrawal period at the injection site given the non homogeneous nature of the studies as shown by the weight differences as well as the way residue levels were determined (3 samples versus just one), and therefore the ‘ alternative approach’ as set out in the CVMP Note for guidance on the approach towards harmonisation of withdrawal periods (EMEA/ CVMP/ 036/ 95) was used.