Table 1.
Descriptive statistics of the study participants.
| Male | Female | |
|---|---|---|
| Numbers (%) | 77 (32.6) | 159 (67.4) |
| Zygosity (complete pairs) | ||
| Monozygotic | 13 6 | 45 21 |
| Dizygotic | 64 30 | 106 (48) |
| Unknown | 0 | 8 4 |
| Mean age in 2006 (years) (sd) | 40.4 (8.4) | 41.4 (7.3) |
| Mean BMI in 2002 (kg/m2) | 27.3 (4.4) | 28.4 (7.1) |
| Mean BMI in 2006 (kg/m2) | 28.8 (4.8) | 29.5 (6.8) |
| Life events experiencing prior to age 17 | ||
| Lived in children's home | ||
| Number of experienced | 8 | 14 |
| Mean age (sd)a | — | — |
| Mean length/years (sd)b | 1.8 (1.1) | 1.9 (2.3) |
| Separated from motherc | ||
| Number of experienced | 18 | 31 |
| Mean age (sd)a | 12.5 (3.9) | 12.8 (5.0) |
| Mean length/years (sd)b | 3.2 (3.2) | 1.8 (1.4) |
| Separated from fatherc | ||
| Number of experienced | 20 | 41 |
| Mean age (sd)a | 11.8 (5.6) | 10.7 (6.0) |
| Mean length/years (sd)b | 4.5 (5.6) | 4.5 (5.6) |
a
Mean age at the first separation of the twin individuals who answered this question.
b
Mean length for the separation of the twin individuals who answered this question.
c
Separation for one year or more.