Is the increase in osteoporosis prevention a result of the audit?

Lozsadi et al. [1] recently published their findings on osteoporosis prevention among corticosteroid-treated neurology patients. They found that prior to an intervention, 29/48 (60%) patients were being treated with osteoporosis prevention. The intervention consisted of a departmental seminar of the findings from the pre-intervention audit as well as a lecture of a national (UK) corticosteroid-induced osteoporosis guideline [2]. Following the intervention, the number of patients treated with osteoporosis prevention increased to 79% in 2001 (second audit) and further increased to 92% in 2003 (third audit). This is a great result; however, I am not convinced that the increase in osteoporosis prevention is from a direct result of the intervention.