Table 1.
Descriptive Characteristics of the Minnesota Center for Twin and Family Research Longitudinal Samples
| Assessment | MTFS Younger Cohort | MTFS Older Cohort | ES | SIBS | |
|---|---|---|---|---|---|
|
| |||||
| Offspring: | |||||
|
| |||||
| Intake: | Mean(SD) Age | 11.7 (0.4) | 17.5 (0.5) | 11.9 (0.4) | 14.9 (1.9) |
| Min, Max Age | 10.7, 12.8 | 16.5, 18.5 | 10.9, 13.0 | 10.7, 20.9 | |
| # Participants | N=1519 | N=1252 | N=998 | N=1232 | |
|
| |||||
| Follow-up #1: | Mean(SD) Age | 14.8 (0.5) | 20.7 (0.6) | 15.1 (0.6) | 18.3 (2.1) |
| Min, Max Age | 13.6, 16.9 | 19.4, 22.7 | 13.6, 17.0 | 13.7, 25.4 | |
| # Participants | N=1409 | N=1111 | N=930 | N=1158 | |
|
| |||||
| Follow-up #2: | Mean(SD) Age | 18.2 (0.7) | 24.7 (1.0) | In progress | In progress |
| Min, Max Age | 16.6, 20.3 | 22.6, 29.3 | |||
| # Participants | N=1325 | N=1167 | |||
|
| |||||
| Follow-up #3: | Mean(SD) Age | 21.5 (0.8) | 29.6 (0.6) | In progress | NA |
| Min, Max Age | 19.6, 24.3 | 28.4, 32.4 | |||
| # Participants | N=1339 | N=1168 | |||
|
| |||||
| Follow-up #4: | Mean(SD) Age | 25.3 (0.7) | NA | NA | NA |
| Min, Max Age | 23.7, 27.9 | ||||
| # Participants | N=1332 | ||||
|
| |||||
| Follow-up #5: | Mean(SD) Age | In progress | NA | NA | NA |
| Min, Max Age | |||||
| # Participants | |||||
|
| |||||
| Parents: | |||||
|
| |||||
| Intake: | Mean(SD) Age | 40.5 (5.2) | 45.2 (5.3) | 42.3 (5.5) | 47.4 (4.4) |
| Min, Max Age | 22.8, 65.3 | 29.9, 66.1 | 26.4, 42.3 | 35.3, 64.3 | |
| # Participants | N=1505 | N=1221 | N=936 | N=1164 | |
Note: MTFS = Minnesota Twin family Study, ES = Enrichment Study, SIBS = Sibling Interaction and Behavior Study. Assessments currently in progress are designated as such; follow-up assessments which have not yet been undertaken are designated as NA.