The review authors thank the authors of the previous version of this review (Kenworthy 2003): Tracy Kenworthy, Clive Adams, Belinda Brooks‐Gordon, Charlotte Bilby and Mark Fenton. We also thank both Nadja Smailagic and Hannah Jones, authors on the protocol for this review.

Thanks are due to Joanne Abbott and Margaret Anderson, former and current Trial Search Co‐ordinators of the Cochrane Developmental, Psychosocial and Learning Problems Review Group, for their help in running searches and obtaining articles. We also thank Dot Jeffcott of the Prison Service College Library (UK) for helping us acquire a copy of a 1991 study by Ruth Hopkins, which is included in this review, and to Dr Jo Yaffe (USA) of the Campbell Collaboration, for her help in accessing a key dissertation from 1972 relevant to another included study within this review.

Thanks also to Professor Moira Livingston (UK) for her attempts to help us locate contact details for Dr Ruth Marshall (neé Hopkins) (Australia) and to Dr Marshall, Dr McAnaney (USA), Dr Anderson‐Varney (USA), Professor Alex Blaszczynski (Australia), Professor Paul Federoff (Canada), Dr Janice Marques (USA) and Professor Linda Williams (USA) for supplying helpful clarifications on methods/additional outcome data for eight of the 10 studies included in this review.

We gratefully acknowledge the contribution of the National Institute for Health Research through their NHS Cochrane Collaboration Programme Grant Scheme.