Table 1.
twin correlations | |||
---|---|---|---|
within-trait | cross-trait | ||
Zygosity group | DSM-IV DGa | SOGS | DSM-IV and SOGS |
MZ male | 0.49 (0.30 – 0.65) | 0.64 (0.52 – 0.74) | 0.48 (0.35 – 0.59) |
DZ male-male | 0.21 (0.00 – 0.45) | 0.19 (0.00 – 0.38) | 0.18 (0.00 – 0.35) |
MZ female | 0.55 (0.34 – 0.72) | 0.49 (0.37 – 0.60) | 0.46 (0.32 – 0.58) |
DZ female-female | 0.21 (0.00 – 0.51) | 0.28 (0.12 – 0.43) | 0.23 (0.04 – 0.40) |
DZ male-female | 0.22 (0.01 – 0.41) | 0.16 (0.01 – 0.30) | 0.12 (0.00 – 0.25) |
Note: DSM-IV = Diagnostic and Statistical Manual of Mental Disorders, Version 4. Cell entries are tetrachoric correlations; 95% confidence intervals are in parentheses.