Table 4.

Cross-twin cross-trait correlations between educational level and alcohol problems

	Females			Males
	Education	RAPI	Max. drinks	Education	RAPI	Max. drinks
Education	—	−.07	−.15	—	−.02	−.04
RAPI	−.03	—	.13	−.08	—	.12
Max. drinks	–.01	.28	—	−12	.31	—

Notes: Monozygotic correlations are below and same-sex dizygotic correlations above the diagonal. The correlations were calculated using the double-entry method. RAPI = Rutgers Alcohol Problem Index; max. drinks = maximum number of drinks consumed in a 24-hour period