International Youth Development Study (IYDS)
The International Youth Development Study (IYDS) is a long-term study that looks at the development of healthy and problem behaviours among young people in the state of Victoria, Australia and the state of Washington, United States.
IYDS is one of the first studies designed to examine whether or not differences in Australian and American cultures and schools affect youth development. The study began in 2002. The original sample included approximately 1000 students at each of three year levels in both Victoria and Washington, giving a total of nearly 6000 participants. The study continues to follow-up participants into adulthood.
| Year | 2002 | 2003 | 2004 | 2006 | 2007 | 2008 | 2010 | 2012 | 2014 |
|---|---|---|---|---|---|---|---|---|---|
| Wave | 1 | 2 | 3 | 4 | 5 | 6 | F1 | F2 | F3 |
| Age | 9-16 years | 11-17 years | 11-16 years | 14-16 years | 15-17 years | 16-18 years | 17-24 years | 20-26 years | 22-28 years |
| N | 2884 | 2884 | 1909 | 927 | 927 | 926 | 2872 | 2871 | 2870 |
| RELEVANT LIFECOURSE DOMAINS | Anthropometrics | ||||||||
| Community environment | |||||||||
| Demographics | |||||||||
| Education and childcare | |||||||||
| Family environment | |||||||||
| Health services | Health services | ||||||||
| Mental health and behaviour problems | |||||||||
| Methodology | |||||||||
| Miscellaneous | |||||||||
| Other health information | Other health information | ||||||||
| Peer relationships | |||||||||
| Physical activity | |||||||||
| Pregnancy and birth | |||||||||
| Psychosocial wellbeing | |||||||||
| Puberty | |||||||||
| Romantic relationships | |||||||||
| Screen and technology use | |||||||||
| Sexual health and activity | |||||||||
| Sleep | |||||||||
| Speech and language | |||||||||
| Substance use | |||||||||
| Temperament and personality | |||||||||
| Study Summary | |
|---|---|
| Study name | International Youth Development Study |
| Study abbreviation | IYDS |
| Current principal investigator/s |
John Toumbourou Richard Catalano Sheryl Hemphill |
| Current project manager |
Rachel Smith |
| Primary Institution/s |
Centre for Adolescent Health |
| Collaborating Institution/s |
Social Development Research Group, University of Washington Australian Catholic University Deakin University |
| Major funding source/s |
National Health and Medical Research Council - NHMRC Australian Research Council - ARC NIAAA |
| Study website | http://www.rch.org.au/iyds/ |
| Key reference for study | McMorris, B.J., Hemphill, S.A., Toumbourou, J.W., Catalano, R.F. and Patton, G.C. (2007). Prevalence of substance use and delinquent behavior in adolescents from Victoria, Australia and Washington State, United States. Health Education and Behavior, 34: 634-650 |
| Study focus |
Risk and protective factors, as well as healthy and problem behaviours in young people including substance use, delinquency, violence, risky sex, depression and self-harm |
| Sampling frame |
In 2002, a two-stage cluster sample design was used to recruit students in both states (Victoria, Australia and Washington State, USA). In the first stage, schools were selected at random, based on a probability proportional to grade-level size from a stratified sampling frame of all schools in Victoria (government, Catholic and independent) and Washington (public, private and alternative). At Stage 2, single intact classes from each school for the selected grade level (Grade 5, 7, or 9) were chosen at random; in a few cases, 2 classes from different year levels were randomly chosen at a school |
| Primary study type | Longitudinal cohort |
| Year commenced |
2002 |
| Is this study ongoing? | Yes - the study is ongoing |
| Ongoing recruitment? | No |
| Sample size (N) |
5769 participants were recruited in total, including 2884 Australian participants and 2885 USA participants |
| Survey data available? | Yes |
| Imaging data available? | No |
| Linkage to administrative dataset/s? | No, no consent to link to administrative dataset(s) obtained |
| Biosamples available? | No |
| Are data available to others outside study team, with appropriate safeguards and structures in line with the cohort’s ethics and governance processes? | Yes |
| Are there any costs associated with data/sample access for approved requests? | There are usually no costs associated with access |
| Broadest type of participant consent available |
Specific consent (can be used for this project only) |
| Wave | Year | Age | Sample size (N) |
|---|---|---|---|
| 1 | 2002 | 9-16 years | N(Total)=2884 |
| 2 | 2003 | 11-17 years | N(Total)=2884 |
| 3 | 2004 | 11-16 years | N(Total)=1909 |
| 4 | 2006 | 14-16 years | N(Total)=927 |
| 5 | 2007 | 15-17 years | N(Total)=927 |
| 6 | 2008 | 16-18 years | N(Total)=926 |
| F1 | 2010 | 17-24 years | N(Total)=2872 |
| F2 | 2012 | 20-26 years | N(Total)=2871 |
| F3 | 2014 | 22-28 years | N(Total)=2870 |
| Study Contacts | |
|---|---|
| Principal investigator/s |
John Toumbourou Richard Catalano Sheryl Hemphill |
| Project manager |
Rachel Smith |
| Study Contact |
Email: iyds@rch.org.au |