Table 1.
Years of Assessments, Ages of Participants, Number of Data Collection Waves, Number of Unique Individuals and Geographical Location of Participating Studies
| Years | Ages | Wave | N# | Location | Abbreviationa | |
|---|---|---|---|---|---|---|
| Add health | 1994– | 12–18, 13–19, 18–26, 24–32 | 1–4 | 1556 | United States | US |
| LTS | 1992– | 12–13, 17–19 | 2 | 3166 | United States: Colorado | CO |
| CTS | 13–18 | 1 | ||||
| MFTS | 1990– | 11–12, 14–15, 17–18, 20–21 | 1–6 | 4137 | United States: Minnesota | MN |
| MASATS | 1995–1997 | 11–18 | 1 | 2211 | United States: VA, NC | NC |
| VTSABD-YAFU-TSA | 1986–2007 | 8–16, 18–30, 22–32 | 1–6 | 2832 | United States: VA | VA |
| CVT | 1983–1993 | 9–17 | 1–5 | 1180 | United States: VA | VA2 |
| EFPTS: LLTS | 1986–1999 | 10–16, 18 | 1–8 | 210 | Belgium: EFPTS | BE |
| FTC: FinnTwin16 | 1991–1997 | 16, 17,18 | 1–3 | 14 279 | Finland | FI |
| FTC: FinnTwin12 | 1997–2004 | 14, 17 | 2, 3 | |||
| FTC: Old cohort | 1975 | 18–19 | 1 | |||
| NTR | 1991– | 13–22 | 1–8 | 13 425 | the Netherlands | NL |
| STR: TCHAD | 1993– | 8–9, 13–14, 16–17, 19–20 | 1–4 | 2942 | Sweden: STR | SW |
| ATR: AYATS | 1988–1996 | 13–18 | 1–3 | 2888 | Australia: ATR | AU |
Add Health = National Longitudinal Study of Adolescent Health; ATR: AYATS = Australian Twin Registry: Australian Young Adult Twin Study; CTS = Colorado Twin Registry Community Twin Sample; CVT = Medical College of Virginia CardioVascular Twin Study; EFPTS: LLTS = East Flanders Prospective Twin Survey: Leuven Longitudinal Twin Study; FTC = Finnish Twin Cohort; NTR = Netherlands Twin Registry; LTS = Colorado Longitudinal Twin Sample; MATR: MASATS = Mid-Atlantic Twin Registry: Mid-Atlantic School Age Twin Study; MFTS = Minnesota Family and Twin Studies; STR: TCHAD = Swedish Twin Registry: Twin Study of Child and Adolescent Development; VTSABD-YAFU-TSA = Virginia Twin Study of Adolescent Behavioral Development-Young Adult Follow-up-Transitions to Substance Use.
aTwo-letter abbreviations to be used in tables and graphs.