Table 2.

Twin Correlations in Liability for Disordered Gambling

Zygosity Group	Twin Correlation (95% CI)a
Male MZ	0.49 (0.30–0.65)
Male/male DZ	0.21 (0.00–0.45)
Female MZ	0.55 (0.34–0.72)
Female/female DZ	0.21 (0.00–0.51)
Male/female DZ	0.22 (0.01–0.41)

Abbreviations: CI, confidence interval; DZ, dizygotic; MZ, monozygotic.

^aTetrachoric correlations.