The impact of patient and public involvement on UK NHS health care: a systematic review

Study selection UK studies from 1997 to 2009 which included service user involvement in NHS healthcare services.

Conclusion There is a need for significant development of the PPI (Patient Public Involvement) evidence base particularly around guidance for the reporting of user activity and impact. The evidence base needs to be significantly strengthened to ensure the full impact of involving service users in NHS healthcare services is fully understood.