The H&T network may also be interested in this paper, though it relates to England. www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0050606 Regards, Jenny Dr Jennifer Mindell Clinical senior lecturer Health and Social Surveys Research Group Research Department of Epidemiology and Public Health UCL 1-19 Torrington Place London WC1E 6BT Tel. 020 7679 1269 Fax 020 7813 0242