Youth crime and youth justice, basic and advanced statistics, victim surveys, secondary analysis of existing data, and research ethics.
Selected recent publications
Percy, A. & Iwaniec, D. (2010). Teenage Drinking: Causes and Consequences. Saarbrucken: LAP Lambert Academic Publishing. [book]
McCrystal, P & Percy, A. (2010). Factors associated with teenage ecstasy use. Drugs: Education, Prevention, and Policy, 17, 507-527. [abstract]
McAloney, K., McCrystal, P., & Percy, A. (2010). Sex, drugs and STDs: Preliminary findings from the Belfast Youth Development Study. Drugs, Education Prevention and Policy, 17, 443-453. [abstract]
Cupples, M.E., Stewart, M.C., Percy, A., Hepper, P., Murphy, C.A., & Halliday, H.L., (2010). A RCT of peer-mentoring for mothers in socially disadvantaged areas (The MOMENTS Study). Archives of Diseases in Childhood. [abstract]
McCrystal, P. & Percy, A. (2009). A profile of cocaine use in Northern Ireland. International Journal of Drug Policy, 20, 357-364. [abstract]
McAloney, K., McCrystal, P., Percy, A. & McCartan, C. (2009). Damaged youth: Prevalence of community violence exposure and implications for adolescent well-being in a post conflict society. Journal of Community Psychology, 37, 635-648. [abstract]
Percy, A., Thornton, M. & McCrystal, P. (2008). The extent and nature of family alcohol and drug use: Findings from the Belfast Youth Development Study. Child Abuse Review, 17, 371-386. [abstract]
Percy, A. (2008). Moderate adolescent drug use and the development of substance use self-regulation. International Journal of Behavioural Development, 32, 451-458. [abstract]
Percy, A. & Iwaniec, D. (2008). Antecedents of hazardous teenage drinking: Analysis of the 1970 British Cohort Study. CLS Working Paper Series 2008/6. London: Centre for Longitudinal Studies, Institute of Education. [Working paper 2008/6]
Murphy, C.A., Cupples, M.E., Percy, A., Halliday, H.L., Stewart, M.C. (2008). Peer-mentoring for first-time mothers from areas of socio-economic disadvantage: A qualitative study within a randomised controlled trial. BMC Health Services Research, 8, 46 (27 February 2008). [BMC HSR paper]
Percy, A., McCrystal, P., & Higgins, K. (2008). Confirmatory factor analysis of the adolescent self-report Strengths and Difficulties Questionnaire. European Journal of Psychological Assessment, 24, 43-48. [abstract]
McCrystal, P., Percy, A., & Higgins, K (2007). School Exclusion Drug Use and Antisocial Behaviour at 15/16 years: Implications for Youth Transitions. Vulnerable Children and Youth Studies, 2, 181-190.
McCrystal, P., Percy, A., & Higgins, K (2007). Substance use behaviours of young people with a moderate learning disability: A Longitudinal Analysis. American Journal of Drug and Alcohol Abuse, 33, 155-162
Percy, A. & Iwaniec, D. (2007). The validity of a latent class typology of adolescent drinking patterns. Irish Journal of Psychological Medicine, 24, 13-18. [IJPM Paper]
McCrystal, P., Higgins, K., & Percy, A., (2007). Frequent cannabis use amongst aged 14/15 year olds in Northern Ireland. Drug and Alcohol Dependence, 88, 19-27. [abstract]
McCrystal, P., Percy, A., & Higgins, K (2007). Exclusion and marginalisation: the experience of school exclusion on drug use and antisocial behaviour. Journal of Youth Studies, 10 (1), 35-54. [abstract]
McCrystal, P., Higgins, K., & Percy, A. (2007). The cost of drug use in adolescence: young people, money and substance abuse. Drugs: Education Policy and Prevention, 14,1 19-28.
McCrystal, P., Higgins, K., & Percy, A. (2006). School exclusion, drug use and delinquency in adolescence. Journal of Adolescence, 29, 829-836.
McCrystal, P., Percy, A., & Higgins, K (2006). Drug use patterns and behaviours of young people at an increased risk of drug abuse during adolescence. International Journal of Drug Policy, 17, 393-401.
Percy, A., McAlister, S., Higgins, K., McCrystal, P. & Thornton, M. (2005) Response consistency in adolescent drug use self-reports, Addiction, 100, 189-196. [abstract]