Judith Stephenson

The effect of dislike of school on risk of teenage pregnancy: testing of hypotheses using longitudinal data from a randomised trial of sex education

Strange, Chris Bonell, Andrew J Copas, 2005, Journal of Epidemiology and Community Health.

A cognitive behavioural intervention to reduce sexually transmitted infections among gay men: randomised trial

Anne M Johnson, A. Copas, J. Stephenson, 2001, BMJ : British Medical Journal.