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. Author manuscript; available in PMC: 2012 Aug 1.
Published in final edited form as: J Abnorm Psychol. 2011 Aug;120(3):743–751. doi: 10.1037/a0022879

Table 1.

Univariate and bivariate twin correlations in liability for disordered gambling as defined by the DSM-IV (DSM-IV DG) and South Oaks Gambling Screen (SOGS).

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.